java -Xmx8000000000 -jar /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data -tc ../../../trunk/examples/toolchains/AutomizerCInline.xml -s ../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default-EXP.epf -i ../../../trunk/examples/svcomp/loop-acceleration/array_false-unreach-call3_true-termination.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-1dbac8b [2018-10-27 09:05:12,742 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-27 09:05:12,744 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-27 09:05:12,758 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-10-27 09:05:12,759 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-10-27 09:05:12,760 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-10-27 09:05:12,761 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-10-27 09:05:12,763 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-10-27 09:05:12,765 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-10-27 09:05:12,766 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-10-27 09:05:12,767 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-10-27 09:05:12,767 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-10-27 09:05:12,768 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-10-27 09:05:12,769 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-10-27 09:05:12,770 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-10-27 09:05:12,771 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-10-27 09:05:12,772 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-10-27 09:05:12,774 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-10-27 09:05:12,776 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-10-27 09:05:12,778 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-10-27 09:05:12,779 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-10-27 09:05:12,780 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-10-27 09:05:12,783 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-10-27 09:05:12,784 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-10-27 09:05:12,784 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-10-27 09:05:12,785 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-10-27 09:05:12,786 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-10-27 09:05:12,787 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-10-27 09:05:12,788 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-10-27 09:05:12,789 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-10-27 09:05:12,789 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-10-27 09:05:12,790 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... 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[2018-10-27 09:05:12,793 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default-EXP.epf [2018-10-27 09:05:12,815 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-27 09:05:12,815 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-27 09:05:12,817 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-10-27 09:05:12,817 INFO L133 SettingsManager]: * User list type=DISABLED [2018-10-27 09:05:12,817 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-10-27 09:05:12,817 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-10-27 09:05:12,817 INFO L133 SettingsManager]: * Explicit value domain=true [2018-10-27 09:05:12,818 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-10-27 09:05:12,818 INFO L133 SettingsManager]: * Octagon Domain=false [2018-10-27 09:05:12,818 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-10-27 09:05:12,818 INFO L133 SettingsManager]: * Log string format=TERM [2018-10-27 09:05:12,818 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-10-27 09:05:12,819 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-10-27 09:05:12,819 INFO L133 SettingsManager]: * Interval Domain=false [2018-10-27 09:05:12,820 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-10-27 09:05:12,820 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-10-27 09:05:12,821 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-10-27 09:05:12,822 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-10-27 09:05:12,822 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-10-27 09:05:12,822 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-10-27 09:05:12,822 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-10-27 09:05:12,823 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-10-27 09:05:12,823 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-27 09:05:12,823 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-10-27 09:05:12,823 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-10-27 09:05:12,823 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-10-27 09:05:12,823 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-27 09:05:12,824 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-27 09:05:12,824 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-10-27 09:05:12,825 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-10-27 09:05:12,825 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-10-27 09:05:12,825 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-10-27 09:05:12,825 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-27 09:05:12,825 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-10-27 09:05:12,826 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-10-27 09:05:12,826 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-10-27 09:05:12,883 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-27 09:05:12,899 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-27 09:05:12,906 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-27 09:05:12,908 INFO L271 PluginConnector]: Initializing CDTParser... [2018-10-27 09:05:12,908 INFO L276 PluginConnector]: CDTParser initialized [2018-10-27 09:05:12,910 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/svcomp/loop-acceleration/array_false-unreach-call3_true-termination.i [2018-10-27 09:05:12,992 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/9ee75bb67/2213733b95744bbf8d3e509df1059fa1/FLAG8fea19448 [2018-10-27 09:05:13,550 INFO L298 CDTParser]: Found 1 translation units. [2018-10-27 09:05:13,551 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/array_false-unreach-call3_true-termination.i [2018-10-27 09:05:13,559 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/9ee75bb67/2213733b95744bbf8d3e509df1059fa1/FLAG8fea19448 [2018-10-27 09:05:13,574 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/9ee75bb67/2213733b95744bbf8d3e509df1059fa1 [2018-10-27 09:05:13,586 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-27 09:05:13,587 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-10-27 09:05:13,589 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-10-27 09:05:13,589 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-10-27 09:05:13,593 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-10-27 09:05:13,595 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 27.10 09:05:13" (1/1) ... [2018-10-27 09:05:13,598 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@24227eaa and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 09:05:13, skipping insertion in model container [2018-10-27 09:05:13,599 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 27.10 09:05:13" (1/1) ... [2018-10-27 09:05:13,611 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-10-27 09:05:13,635 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-10-27 09:05:13,846 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-27 09:05:13,851 INFO L189 MainTranslator]: Completed pre-run [2018-10-27 09:05:13,882 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-27 09:05:13,914 INFO L193 MainTranslator]: Completed translation [2018-10-27 09:05:13,915 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 09:05:13 WrapperNode [2018-10-27 09:05:13,915 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-10-27 09:05:13,916 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-10-27 09:05:13,917 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-10-27 09:05:13,917 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-10-27 09:05:13,930 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 09:05:13" (1/1) ... [2018-10-27 09:05:13,948 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 09:05:13" (1/1) ... [2018-10-27 09:05:13,977 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-10-27 09:05:13,977 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-27 09:05:13,977 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-27 09:05:13,978 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-27 09:05:13,992 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 09:05:13" (1/1) ... [2018-10-27 09:05:13,992 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 09:05:13" (1/1) ... [2018-10-27 09:05:13,995 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 09:05:13" (1/1) ... [2018-10-27 09:05:13,996 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 09:05:13" (1/1) ... [2018-10-27 09:05:14,003 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 09:05:13" (1/1) ... [2018-10-27 09:05:14,012 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 09:05:13" (1/1) ... [2018-10-27 09:05:14,014 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 09:05:13" (1/1) ... [2018-10-27 09:05:14,023 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-27 09:05:14,025 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-27 09:05:14,025 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-27 09:05:14,026 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-27 09:05:14,027 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 09:05:13" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-27 09:05:14,205 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-10-27 09:05:14,206 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-10-27 09:05:14,206 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-10-27 09:05:14,206 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-10-27 09:05:14,206 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-10-27 09:05:14,206 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-10-27 09:05:14,207 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-10-27 09:05:14,207 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-10-27 09:05:14,628 INFO L341 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-10-27 09:05:14,629 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 27.10 09:05:14 BoogieIcfgContainer [2018-10-27 09:05:14,629 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-27 09:05:14,630 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-27 09:05:14,631 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-27 09:05:14,635 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-27 09:05:14,635 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 27.10 09:05:13" (1/3) ... [2018-10-27 09:05:14,636 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@27625b4f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 27.10 09:05:14, skipping insertion in model container [2018-10-27 09:05:14,636 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 09:05:13" (2/3) ... [2018-10-27 09:05:14,637 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@27625b4f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 27.10 09:05:14, skipping insertion in model container [2018-10-27 09:05:14,637 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 27.10 09:05:14" (3/3) ... [2018-10-27 09:05:14,639 INFO L112 eAbstractionObserver]: Analyzing ICFG array_false-unreach-call3_true-termination.i [2018-10-27 09:05:14,651 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-10-27 09:05:14,660 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-27 09:05:14,678 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-10-27 09:05:14,713 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-10-27 09:05:14,713 INFO L383 AbstractCegarLoop]: Hoare is true [2018-10-27 09:05:14,714 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-10-27 09:05:14,714 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-27 09:05:14,714 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-27 09:05:14,715 INFO L387 AbstractCegarLoop]: Difference is false [2018-10-27 09:05:14,715 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-27 09:05:14,716 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-27 09:05:14,737 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states. [2018-10-27 09:05:14,745 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-10-27 09:05:14,745 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:05:14,747 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:05:14,750 INFO L424 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:05:14,757 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:05:14,757 INFO L82 PathProgramCache]: Analyzing trace with hash 1097964223, now seen corresponding path program 1 times [2018-10-27 09:05:14,760 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:05:14,819 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:05:14,820 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:05:14,820 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:05:14,820 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:05:14,865 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:05:14,913 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:05:14,916 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-27 09:05:14,916 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-10-27 09:05:14,917 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-27 09:05:14,922 INFO L460 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-10-27 09:05:14,937 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-10-27 09:05:14,937 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-27 09:05:14,941 INFO L87 Difference]: Start difference. First operand 25 states. Second operand 2 states. [2018-10-27 09:05:14,971 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:05:14,972 INFO L93 Difference]: Finished difference Result 41 states and 48 transitions. [2018-10-27 09:05:14,972 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-10-27 09:05:14,973 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 13 [2018-10-27 09:05:14,974 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:05:14,986 INFO L225 Difference]: With dead ends: 41 [2018-10-27 09:05:14,986 INFO L226 Difference]: Without dead ends: 18 [2018-10-27 09:05:14,994 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-27 09:05:15,018 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2018-10-27 09:05:15,038 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2018-10-27 09:05:15,040 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2018-10-27 09:05:15,042 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2018-10-27 09:05:15,044 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 13 [2018-10-27 09:05:15,045 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:05:15,045 INFO L481 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2018-10-27 09:05:15,045 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-10-27 09:05:15,045 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2018-10-27 09:05:15,048 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2018-10-27 09:05:15,048 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:05:15,049 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:05:15,049 INFO L424 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:05:15,049 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:05:15,050 INFO L82 PathProgramCache]: Analyzing trace with hash 1413574900, now seen corresponding path program 1 times [2018-10-27 09:05:15,050 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:05:15,055 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:05:15,055 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:05:15,056 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:05:15,057 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:05:15,095 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:05:15,193 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:05:15,194 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-27 09:05:15,194 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-10-27 09:05:15,194 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-27 09:05:15,196 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-10-27 09:05:15,197 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-10-27 09:05:15,197 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-27 09:05:15,197 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand 3 states. [2018-10-27 09:05:15,403 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:05:15,403 INFO L93 Difference]: Finished difference Result 34 states and 37 transitions. [2018-10-27 09:05:15,404 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-10-27 09:05:15,404 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 15 [2018-10-27 09:05:15,405 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:05:15,408 INFO L225 Difference]: With dead ends: 34 [2018-10-27 09:05:15,408 INFO L226 Difference]: Without dead ends: 25 [2018-10-27 09:05:15,409 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-27 09:05:15,410 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2018-10-27 09:05:15,415 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 20. [2018-10-27 09:05:15,416 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2018-10-27 09:05:15,416 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 21 transitions. [2018-10-27 09:05:15,417 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 21 transitions. Word has length 15 [2018-10-27 09:05:15,417 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:05:15,417 INFO L481 AbstractCegarLoop]: Abstraction has 20 states and 21 transitions. [2018-10-27 09:05:15,418 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-10-27 09:05:15,418 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 21 transitions. [2018-10-27 09:05:15,419 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2018-10-27 09:05:15,419 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:05:15,419 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:05:15,420 INFO L424 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:05:15,420 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:05:15,420 INFO L82 PathProgramCache]: Analyzing trace with hash -1818930225, now seen corresponding path program 1 times [2018-10-27 09:05:15,420 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:05:15,422 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:05:15,422 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:05:15,423 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:05:15,423 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:05:15,460 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:05:15,621 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:05:15,622 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:05:15,622 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:05:15,623 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 19 with the following transitions: [2018-10-27 09:05:15,625 INFO L202 CegarAbsIntRunner]: [0], [1], [5], [9], [12], [14], [16], [20], [24], [27], [38], [41], [43], [49], [50], [51], [53] [2018-10-27 09:05:15,670 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, ExplicitValueDomain] [2018-10-27 09:05:15,670 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-27 09:05:15,930 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-27 09:05:15,932 INFO L272 AbstractInterpreter]: Visited 17 different actions 25 times. Merged at 3 different actions 6 times. Never widened. Found 1 fixpoints after 1 different actions. Largest state had 30 variables. [2018-10-27 09:05:15,972 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:05:15,973 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-27 09:05:15,974 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:05:15,974 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:05:15,985 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:05:15,986 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:05:16,031 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:05:16,041 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:05:16,122 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:05:16,122 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:05:16,238 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:05:16,268 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:05:16,269 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2018-10-27 09:05:16,269 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:05:16,269 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-10-27 09:05:16,270 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-10-27 09:05:16,270 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2018-10-27 09:05:16,271 INFO L87 Difference]: Start difference. First operand 20 states and 21 transitions. Second operand 5 states. [2018-10-27 09:05:16,481 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:05:16,482 INFO L93 Difference]: Finished difference Result 41 states and 45 transitions. [2018-10-27 09:05:16,482 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-10-27 09:05:16,482 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 18 [2018-10-27 09:05:16,483 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:05:16,484 INFO L225 Difference]: With dead ends: 41 [2018-10-27 09:05:16,484 INFO L226 Difference]: Without dead ends: 32 [2018-10-27 09:05:16,485 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2018-10-27 09:05:16,486 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2018-10-27 09:05:16,490 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 23. [2018-10-27 09:05:16,491 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2018-10-27 09:05:16,491 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 24 transitions. [2018-10-27 09:05:16,492 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 24 transitions. Word has length 18 [2018-10-27 09:05:16,492 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:05:16,492 INFO L481 AbstractCegarLoop]: Abstraction has 23 states and 24 transitions. [2018-10-27 09:05:16,492 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-10-27 09:05:16,493 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 24 transitions. [2018-10-27 09:05:16,494 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2018-10-27 09:05:16,494 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:05:16,494 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:05:16,494 INFO L424 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:05:16,495 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:05:16,495 INFO L82 PathProgramCache]: Analyzing trace with hash 377601812, now seen corresponding path program 2 times [2018-10-27 09:05:16,495 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:05:16,497 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:05:16,497 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:05:16,497 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:05:16,498 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:05:16,518 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:05:16,611 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:05:16,612 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:05:16,612 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:05:16,613 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:05:16,613 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:05:16,613 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:05:16,613 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:05:16,632 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 09:05:16,633 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 09:05:16,682 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 1 check-sat command(s) [2018-10-27 09:05:16,682 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:05:16,686 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:05:16,963 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2018-10-27 09:05:16,963 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:05:17,178 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2018-10-27 09:05:17,209 INFO L312 seRefinementStrategy]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2018-10-27 09:05:17,210 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [5, 5] imperfect sequences [5] total 11 [2018-10-27 09:05:17,210 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-27 09:05:17,210 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-10-27 09:05:17,211 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-10-27 09:05:17,212 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=79, Unknown=0, NotChecked=0, Total=110 [2018-10-27 09:05:17,212 INFO L87 Difference]: Start difference. First operand 23 states and 24 transitions. Second operand 5 states. [2018-10-27 09:05:17,313 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:05:17,313 INFO L93 Difference]: Finished difference Result 31 states and 32 transitions. [2018-10-27 09:05:17,314 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-10-27 09:05:17,314 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 21 [2018-10-27 09:05:17,315 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:05:17,315 INFO L225 Difference]: With dead ends: 31 [2018-10-27 09:05:17,315 INFO L226 Difference]: Without dead ends: 26 [2018-10-27 09:05:17,316 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=37, Invalid=95, Unknown=0, NotChecked=0, Total=132 [2018-10-27 09:05:17,317 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2018-10-27 09:05:17,321 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 25. [2018-10-27 09:05:17,321 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2018-10-27 09:05:17,322 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 26 transitions. [2018-10-27 09:05:17,323 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 26 transitions. Word has length 21 [2018-10-27 09:05:17,323 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:05:17,323 INFO L481 AbstractCegarLoop]: Abstraction has 25 states and 26 transitions. [2018-10-27 09:05:17,323 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-10-27 09:05:17,324 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 26 transitions. [2018-10-27 09:05:17,324 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2018-10-27 09:05:17,325 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:05:17,325 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:05:17,325 INFO L424 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:05:17,326 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:05:17,326 INFO L82 PathProgramCache]: Analyzing trace with hash 1343240274, now seen corresponding path program 1 times [2018-10-27 09:05:17,326 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:05:17,327 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:05:17,328 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:05:17,328 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:05:17,328 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:05:17,347 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:05:17,408 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-10-27 09:05:17,408 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:05:17,409 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:05:17,409 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 25 with the following transitions: [2018-10-27 09:05:17,409 INFO L202 CegarAbsIntRunner]: [0], [1], [5], [9], [12], [14], [16], [20], [24], [27], [29], [31], [38], [41], [43], [49], [50], [51], [53] [2018-10-27 09:05:17,412 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, ExplicitValueDomain] [2018-10-27 09:05:17,412 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-27 09:05:17,550 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-27 09:05:17,551 INFO L272 AbstractInterpreter]: Visited 19 different actions 43 times. Merged at 7 different actions 14 times. Never widened. Found 2 fixpoints after 2 different actions. Largest state had 31 variables. [2018-10-27 09:05:17,583 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:05:17,584 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-27 09:05:17,584 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:05:17,584 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:05:17,602 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:05:17,603 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:05:17,643 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:05:17,647 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:05:17,760 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-10-27 09:05:17,761 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:05:17,898 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-10-27 09:05:17,924 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:05:17,925 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 9 [2018-10-27 09:05:17,925 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:05:17,925 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-10-27 09:05:17,926 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-10-27 09:05:17,926 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2018-10-27 09:05:17,927 INFO L87 Difference]: Start difference. First operand 25 states and 26 transitions. Second operand 6 states. [2018-10-27 09:05:18,328 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:05:18,329 INFO L93 Difference]: Finished difference Result 49 states and 53 transitions. [2018-10-27 09:05:18,330 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-10-27 09:05:18,330 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 24 [2018-10-27 09:05:18,330 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:05:18,331 INFO L225 Difference]: With dead ends: 49 [2018-10-27 09:05:18,331 INFO L226 Difference]: Without dead ends: 38 [2018-10-27 09:05:18,332 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 45 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2018-10-27 09:05:18,333 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2018-10-27 09:05:18,343 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 28. [2018-10-27 09:05:18,343 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2018-10-27 09:05:18,346 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 29 transitions. [2018-10-27 09:05:18,346 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 29 transitions. Word has length 24 [2018-10-27 09:05:18,346 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:05:18,350 INFO L481 AbstractCegarLoop]: Abstraction has 28 states and 29 transitions. [2018-10-27 09:05:18,350 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-10-27 09:05:18,350 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 29 transitions. [2018-10-27 09:05:18,353 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2018-10-27 09:05:18,355 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:05:18,355 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:05:18,356 INFO L424 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:05:18,356 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:05:18,356 INFO L82 PathProgramCache]: Analyzing trace with hash 1859017687, now seen corresponding path program 2 times [2018-10-27 09:05:18,356 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:05:18,357 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:05:18,361 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:05:18,362 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:05:18,362 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:05:18,382 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:05:18,495 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-10-27 09:05:18,496 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:05:18,496 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:05:18,496 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:05:18,496 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:05:18,496 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:05:18,497 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:05:18,513 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 09:05:18,513 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 09:05:18,558 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2018-10-27 09:05:18,558 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:05:18,562 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:05:18,625 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-27 09:05:18,626 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:05:18,718 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-27 09:05:18,740 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:05:18,740 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 13 [2018-10-27 09:05:18,741 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:05:18,741 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-10-27 09:05:18,742 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-10-27 09:05:18,742 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=110, Unknown=0, NotChecked=0, Total=156 [2018-10-27 09:05:18,743 INFO L87 Difference]: Start difference. First operand 28 states and 29 transitions. Second operand 9 states. [2018-10-27 09:05:18,913 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:05:18,913 INFO L93 Difference]: Finished difference Result 58 states and 63 transitions. [2018-10-27 09:05:18,913 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-10-27 09:05:18,914 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 27 [2018-10-27 09:05:18,914 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:05:18,915 INFO L225 Difference]: With dead ends: 58 [2018-10-27 09:05:18,915 INFO L226 Difference]: Without dead ends: 42 [2018-10-27 09:05:18,916 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 48 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=52, Invalid=130, Unknown=0, NotChecked=0, Total=182 [2018-10-27 09:05:18,916 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2018-10-27 09:05:18,921 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 40. [2018-10-27 09:05:18,922 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2018-10-27 09:05:18,923 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 41 transitions. [2018-10-27 09:05:18,923 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 41 transitions. Word has length 27 [2018-10-27 09:05:18,923 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:05:18,924 INFO L481 AbstractCegarLoop]: Abstraction has 40 states and 41 transitions. [2018-10-27 09:05:18,924 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-10-27 09:05:18,924 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 41 transitions. [2018-10-27 09:05:18,925 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2018-10-27 09:05:18,925 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:05:18,925 INFO L375 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:05:18,926 INFO L424 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:05:18,926 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:05:18,926 INFO L82 PathProgramCache]: Analyzing trace with hash 192508852, now seen corresponding path program 3 times [2018-10-27 09:05:18,926 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:05:18,927 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:05:18,928 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:05:18,928 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:05:18,928 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:05:18,952 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:05:19,065 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-10-27 09:05:19,068 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:05:19,068 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:05:19,068 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:05:19,069 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:05:19,069 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:05:19,069 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:05:19,083 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 09:05:19,083 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 09:05:19,144 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 09:05:19,144 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:05:19,149 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:05:19,250 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-10-27 09:05:19,251 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:05:19,501 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-10-27 09:05:19,522 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:05:19,522 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 13 [2018-10-27 09:05:19,523 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:05:19,523 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-10-27 09:05:19,523 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-10-27 09:05:19,524 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=78, Unknown=0, NotChecked=0, Total=156 [2018-10-27 09:05:19,525 INFO L87 Difference]: Start difference. First operand 40 states and 41 transitions. Second operand 8 states. [2018-10-27 09:05:19,663 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:05:19,664 INFO L93 Difference]: Finished difference Result 69 states and 72 transitions. [2018-10-27 09:05:19,665 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-10-27 09:05:19,665 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 39 [2018-10-27 09:05:19,666 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:05:19,666 INFO L225 Difference]: With dead ends: 69 [2018-10-27 09:05:19,667 INFO L226 Difference]: Without dead ends: 49 [2018-10-27 09:05:19,667 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 73 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=78, Invalid=78, Unknown=0, NotChecked=0, Total=156 [2018-10-27 09:05:19,668 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2018-10-27 09:05:19,673 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 43. [2018-10-27 09:05:19,673 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2018-10-27 09:05:19,674 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 44 transitions. [2018-10-27 09:05:19,675 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 44 transitions. Word has length 39 [2018-10-27 09:05:19,675 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:05:19,675 INFO L481 AbstractCegarLoop]: Abstraction has 43 states and 44 transitions. [2018-10-27 09:05:19,675 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-10-27 09:05:19,675 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 44 transitions. [2018-10-27 09:05:19,676 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2018-10-27 09:05:19,676 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:05:19,677 INFO L375 BasicCegarLoop]: trace histogram [6, 5, 5, 5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:05:19,677 INFO L424 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:05:19,677 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:05:19,677 INFO L82 PathProgramCache]: Analyzing trace with hash -82233969, now seen corresponding path program 4 times [2018-10-27 09:05:19,678 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:05:19,679 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:05:19,679 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:05:19,679 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:05:19,679 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:05:19,702 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:05:20,327 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-10-27 09:05:20,328 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:05:20,328 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:05:20,328 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:05:20,328 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:05:20,329 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:05:20,329 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:05:20,339 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:05:20,339 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:05:20,378 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:05:20,384 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:05:20,415 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-10-27 09:05:20,415 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:05:20,536 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-10-27 09:05:20,558 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:05:20,559 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 15 [2018-10-27 09:05:20,559 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:05:20,559 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-10-27 09:05:20,560 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-10-27 09:05:20,560 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=105, Unknown=0, NotChecked=0, Total=210 [2018-10-27 09:05:20,560 INFO L87 Difference]: Start difference. First operand 43 states and 44 transitions. Second operand 9 states. [2018-10-27 09:05:20,800 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:05:20,800 INFO L93 Difference]: Finished difference Result 76 states and 80 transitions. [2018-10-27 09:05:20,801 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-10-27 09:05:20,801 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 42 [2018-10-27 09:05:20,802 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:05:20,803 INFO L225 Difference]: With dead ends: 76 [2018-10-27 09:05:20,803 INFO L226 Difference]: Without dead ends: 56 [2018-10-27 09:05:20,804 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 78 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=105, Invalid=105, Unknown=0, NotChecked=0, Total=210 [2018-10-27 09:05:20,805 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2018-10-27 09:05:20,810 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 46. [2018-10-27 09:05:20,811 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2018-10-27 09:05:20,811 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 47 transitions. [2018-10-27 09:05:20,812 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 47 transitions. Word has length 42 [2018-10-27 09:05:20,812 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:05:20,812 INFO L481 AbstractCegarLoop]: Abstraction has 46 states and 47 transitions. [2018-10-27 09:05:20,812 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-10-27 09:05:20,812 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 47 transitions. [2018-10-27 09:05:20,813 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2018-10-27 09:05:20,813 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:05:20,814 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 6, 5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:05:20,814 INFO L424 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:05:20,814 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:05:20,814 INFO L82 PathProgramCache]: Analyzing trace with hash 1262051796, now seen corresponding path program 5 times [2018-10-27 09:05:20,814 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:05:20,815 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:05:20,815 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:05:20,815 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:05:20,816 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:05:20,856 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:05:21,009 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-10-27 09:05:21,010 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:05:21,010 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:05:21,010 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:05:21,010 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:05:21,010 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:05:21,010 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:05:21,020 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 09:05:21,020 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 09:05:21,066 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2018-10-27 09:05:21,066 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:05:21,070 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:05:21,130 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2018-10-27 09:05:21,130 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:05:21,324 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2018-10-27 09:05:21,348 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:05:21,349 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 19 [2018-10-27 09:05:21,349 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:05:21,350 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-10-27 09:05:21,350 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-10-27 09:05:21,351 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=115, Invalid=227, Unknown=0, NotChecked=0, Total=342 [2018-10-27 09:05:21,352 INFO L87 Difference]: Start difference. First operand 46 states and 47 transitions. Second operand 12 states. [2018-10-27 09:05:21,488 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:05:21,488 INFO L93 Difference]: Finished difference Result 85 states and 90 transitions. [2018-10-27 09:05:21,489 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-10-27 09:05:21,489 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 45 [2018-10-27 09:05:21,490 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:05:21,491 INFO L225 Difference]: With dead ends: 85 [2018-10-27 09:05:21,491 INFO L226 Difference]: Without dead ends: 60 [2018-10-27 09:05:21,492 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 81 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 68 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=121, Invalid=259, Unknown=0, NotChecked=0, Total=380 [2018-10-27 09:05:21,493 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2018-10-27 09:05:21,498 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 58. [2018-10-27 09:05:21,498 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2018-10-27 09:05:21,499 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 59 transitions. [2018-10-27 09:05:21,500 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 59 transitions. Word has length 45 [2018-10-27 09:05:21,500 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:05:21,500 INFO L481 AbstractCegarLoop]: Abstraction has 58 states and 59 transitions. [2018-10-27 09:05:21,500 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-10-27 09:05:21,501 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 59 transitions. [2018-10-27 09:05:21,502 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2018-10-27 09:05:21,502 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:05:21,502 INFO L375 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:05:21,502 INFO L424 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:05:21,503 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:05:21,503 INFO L82 PathProgramCache]: Analyzing trace with hash -65813737, now seen corresponding path program 6 times [2018-10-27 09:05:21,503 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:05:21,504 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:05:21,504 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:05:21,505 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:05:21,505 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:05:21,528 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:05:21,679 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2018-10-27 09:05:21,679 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:05:21,679 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:05:21,680 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:05:21,680 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:05:21,680 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:05:21,680 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:05:21,691 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 09:05:21,692 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 09:05:21,744 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 09:05:21,745 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:05:21,750 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:05:21,775 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2018-10-27 09:05:21,775 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:05:21,993 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2018-10-27 09:05:22,016 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:05:22,016 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 19 [2018-10-27 09:05:22,017 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:05:22,017 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-10-27 09:05:22,017 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-10-27 09:05:22,018 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=171, Invalid=171, Unknown=0, NotChecked=0, Total=342 [2018-10-27 09:05:22,018 INFO L87 Difference]: Start difference. First operand 58 states and 59 transitions. Second operand 11 states. [2018-10-27 09:05:22,165 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:05:22,165 INFO L93 Difference]: Finished difference Result 96 states and 99 transitions. [2018-10-27 09:05:22,165 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-10-27 09:05:22,166 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 57 [2018-10-27 09:05:22,166 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:05:22,166 INFO L225 Difference]: With dead ends: 96 [2018-10-27 09:05:22,166 INFO L226 Difference]: Without dead ends: 67 [2018-10-27 09:05:22,167 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 123 GetRequests, 106 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=171, Invalid=171, Unknown=0, NotChecked=0, Total=342 [2018-10-27 09:05:22,167 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2018-10-27 09:05:22,172 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 61. [2018-10-27 09:05:22,172 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2018-10-27 09:05:22,174 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 62 transitions. [2018-10-27 09:05:22,174 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 62 transitions. Word has length 57 [2018-10-27 09:05:22,174 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:05:22,174 INFO L481 AbstractCegarLoop]: Abstraction has 61 states and 62 transitions. [2018-10-27 09:05:22,174 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-10-27 09:05:22,174 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 62 transitions. [2018-10-27 09:05:22,175 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2018-10-27 09:05:22,175 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:05:22,176 INFO L375 BasicCegarLoop]: trace histogram [9, 8, 8, 8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:05:22,176 INFO L424 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:05:22,176 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:05:22,176 INFO L82 PathProgramCache]: Analyzing trace with hash 1181148210, now seen corresponding path program 7 times [2018-10-27 09:05:22,176 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:05:22,177 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:05:22,177 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:05:22,177 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:05:22,177 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:05:22,196 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:05:22,559 INFO L134 CoverageAnalysis]: Checked inductivity of 177 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2018-10-27 09:05:22,560 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:05:22,560 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:05:22,560 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:05:22,560 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:05:22,560 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:05:22,560 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:05:22,570 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:05:22,571 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:05:22,633 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:05:22,638 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:05:22,681 INFO L134 CoverageAnalysis]: Checked inductivity of 177 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2018-10-27 09:05:22,682 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:05:23,057 INFO L134 CoverageAnalysis]: Checked inductivity of 177 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2018-10-27 09:05:23,079 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:05:23,080 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 21 [2018-10-27 09:05:23,080 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:05:23,081 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-10-27 09:05:23,081 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-10-27 09:05:23,081 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=210, Invalid=210, Unknown=0, NotChecked=0, Total=420 [2018-10-27 09:05:23,082 INFO L87 Difference]: Start difference. First operand 61 states and 62 transitions. Second operand 12 states. [2018-10-27 09:05:23,221 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:05:23,222 INFO L93 Difference]: Finished difference Result 103 states and 107 transitions. [2018-10-27 09:05:23,222 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-10-27 09:05:23,222 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 60 [2018-10-27 09:05:23,223 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:05:23,224 INFO L225 Difference]: With dead ends: 103 [2018-10-27 09:05:23,224 INFO L226 Difference]: Without dead ends: 74 [2018-10-27 09:05:23,226 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 111 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=210, Invalid=210, Unknown=0, NotChecked=0, Total=420 [2018-10-27 09:05:23,226 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2018-10-27 09:05:23,231 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 64. [2018-10-27 09:05:23,231 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2018-10-27 09:05:23,232 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 65 transitions. [2018-10-27 09:05:23,232 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 65 transitions. Word has length 60 [2018-10-27 09:05:23,233 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:05:23,233 INFO L481 AbstractCegarLoop]: Abstraction has 64 states and 65 transitions. [2018-10-27 09:05:23,233 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-10-27 09:05:23,233 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 65 transitions. [2018-10-27 09:05:23,234 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2018-10-27 09:05:23,234 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:05:23,234 INFO L375 BasicCegarLoop]: trace histogram [10, 9, 9, 8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:05:23,234 INFO L424 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:05:23,235 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:05:23,235 INFO L82 PathProgramCache]: Analyzing trace with hash -2042599113, now seen corresponding path program 8 times [2018-10-27 09:05:23,235 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:05:23,236 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:05:23,236 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:05:23,236 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:05:23,236 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:05:23,255 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:05:23,423 INFO L134 CoverageAnalysis]: Checked inductivity of 203 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2018-10-27 09:05:23,424 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:05:23,424 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:05:23,424 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:05:23,425 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:05:23,425 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:05:23,425 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:05:23,434 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 09:05:23,434 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 09:05:23,535 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2018-10-27 09:05:23,535 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:05:23,540 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:05:23,649 INFO L134 CoverageAnalysis]: Checked inductivity of 203 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2018-10-27 09:05:23,649 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:05:23,890 INFO L134 CoverageAnalysis]: Checked inductivity of 203 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2018-10-27 09:05:23,912 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:05:23,913 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 25 [2018-10-27 09:05:23,913 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:05:23,913 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-10-27 09:05:23,914 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-10-27 09:05:23,914 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=220, Invalid=380, Unknown=0, NotChecked=0, Total=600 [2018-10-27 09:05:23,915 INFO L87 Difference]: Start difference. First operand 64 states and 65 transitions. Second operand 15 states. [2018-10-27 09:05:24,112 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:05:24,113 INFO L93 Difference]: Finished difference Result 112 states and 117 transitions. [2018-10-27 09:05:24,113 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-10-27 09:05:24,113 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 63 [2018-10-27 09:05:24,114 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:05:24,115 INFO L225 Difference]: With dead ends: 112 [2018-10-27 09:05:24,115 INFO L226 Difference]: Without dead ends: 78 [2018-10-27 09:05:24,117 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 138 GetRequests, 114 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 101 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=226, Invalid=424, Unknown=0, NotChecked=0, Total=650 [2018-10-27 09:05:24,117 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2018-10-27 09:05:24,123 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 76. [2018-10-27 09:05:24,123 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2018-10-27 09:05:24,124 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 77 transitions. [2018-10-27 09:05:24,125 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 77 transitions. Word has length 63 [2018-10-27 09:05:24,125 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:05:24,125 INFO L481 AbstractCegarLoop]: Abstraction has 76 states and 77 transitions. [2018-10-27 09:05:24,125 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-10-27 09:05:24,125 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 77 transitions. [2018-10-27 09:05:24,126 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2018-10-27 09:05:24,126 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:05:24,128 INFO L375 BasicCegarLoop]: trace histogram [11, 11, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:05:24,128 INFO L424 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:05:24,128 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:05:24,129 INFO L82 PathProgramCache]: Analyzing trace with hash -1037724716, now seen corresponding path program 9 times [2018-10-27 09:05:24,129 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:05:24,130 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:05:24,130 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:05:24,131 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:05:24,131 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:05:24,152 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:05:24,332 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2018-10-27 09:05:24,332 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:05:24,332 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:05:24,332 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:05:24,333 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:05:24,333 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:05:24,333 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:05:24,341 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 09:05:24,341 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 09:05:24,419 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 09:05:24,419 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:05:24,425 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:05:24,519 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2018-10-27 09:05:24,519 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:05:24,837 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2018-10-27 09:05:24,858 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:05:24,858 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 25 [2018-10-27 09:05:24,859 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:05:24,859 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-10-27 09:05:24,859 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-10-27 09:05:24,859 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=300, Invalid=300, Unknown=0, NotChecked=0, Total=600 [2018-10-27 09:05:24,860 INFO L87 Difference]: Start difference. First operand 76 states and 77 transitions. Second operand 14 states. [2018-10-27 09:05:25,028 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:05:25,029 INFO L93 Difference]: Finished difference Result 123 states and 126 transitions. [2018-10-27 09:05:25,029 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-10-27 09:05:25,029 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 75 [2018-10-27 09:05:25,030 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:05:25,030 INFO L225 Difference]: With dead ends: 123 [2018-10-27 09:05:25,031 INFO L226 Difference]: Without dead ends: 85 [2018-10-27 09:05:25,033 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 162 GetRequests, 139 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=300, Invalid=300, Unknown=0, NotChecked=0, Total=600 [2018-10-27 09:05:25,033 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2018-10-27 09:05:25,045 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 79. [2018-10-27 09:05:25,046 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2018-10-27 09:05:25,050 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 80 transitions. [2018-10-27 09:05:25,050 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 80 transitions. Word has length 75 [2018-10-27 09:05:25,051 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:05:25,051 INFO L481 AbstractCegarLoop]: Abstraction has 79 states and 80 transitions. [2018-10-27 09:05:25,051 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-10-27 09:05:25,051 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 80 transitions. [2018-10-27 09:05:25,055 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2018-10-27 09:05:25,055 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:05:25,056 INFO L375 BasicCegarLoop]: trace histogram [12, 11, 11, 11, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:05:25,056 INFO L424 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:05:25,056 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:05:25,056 INFO L82 PathProgramCache]: Analyzing trace with hash -448084945, now seen corresponding path program 10 times [2018-10-27 09:05:25,056 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:05:25,061 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:05:25,061 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:05:25,061 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:05:25,061 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:05:25,088 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:05:25,331 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2018-10-27 09:05:25,332 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:05:25,332 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:05:25,332 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:05:25,332 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:05:25,332 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:05:25,332 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:05:25,346 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:05:25,346 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:05:25,407 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:05:25,412 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:05:25,529 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2018-10-27 09:05:25,530 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:05:25,795 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2018-10-27 09:05:25,817 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:05:25,817 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 27 [2018-10-27 09:05:25,817 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:05:25,818 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-10-27 09:05:25,818 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-10-27 09:05:25,819 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=351, Invalid=351, Unknown=0, NotChecked=0, Total=702 [2018-10-27 09:05:25,819 INFO L87 Difference]: Start difference. First operand 79 states and 80 transitions. Second operand 15 states. [2018-10-27 09:05:25,983 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:05:25,983 INFO L93 Difference]: Finished difference Result 130 states and 134 transitions. [2018-10-27 09:05:25,984 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-10-27 09:05:25,984 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 78 [2018-10-27 09:05:25,984 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:05:25,985 INFO L225 Difference]: With dead ends: 130 [2018-10-27 09:05:25,986 INFO L226 Difference]: Without dead ends: 92 [2018-10-27 09:05:25,987 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 169 GetRequests, 144 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=351, Invalid=351, Unknown=0, NotChecked=0, Total=702 [2018-10-27 09:05:25,987 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2018-10-27 09:05:25,996 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 82. [2018-10-27 09:05:25,996 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 82 states. [2018-10-27 09:05:25,997 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 83 transitions. [2018-10-27 09:05:25,997 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 83 transitions. Word has length 78 [2018-10-27 09:05:25,997 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:05:25,998 INFO L481 AbstractCegarLoop]: Abstraction has 82 states and 83 transitions. [2018-10-27 09:05:25,998 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-10-27 09:05:25,998 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 83 transitions. [2018-10-27 09:05:25,999 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2018-10-27 09:05:25,999 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:05:25,999 INFO L375 BasicCegarLoop]: trace histogram [13, 12, 12, 11, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:05:26,000 INFO L424 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:05:26,000 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:05:26,000 INFO L82 PathProgramCache]: Analyzing trace with hash -905907724, now seen corresponding path program 11 times [2018-10-27 09:05:26,000 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:05:26,001 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:05:26,001 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:05:26,001 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:05:26,002 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:05:26,024 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:05:26,275 INFO L134 CoverageAnalysis]: Checked inductivity of 377 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2018-10-27 09:05:26,275 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:05:26,275 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:05:26,275 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:05:26,276 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:05:26,276 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:05:26,276 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:05:26,288 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 09:05:26,289 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 09:05:26,411 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2018-10-27 09:05:26,411 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:05:26,415 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:05:26,621 INFO L134 CoverageAnalysis]: Checked inductivity of 377 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 222 trivial. 0 not checked. [2018-10-27 09:05:26,622 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:05:27,016 INFO L134 CoverageAnalysis]: Checked inductivity of 377 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 222 trivial. 0 not checked. [2018-10-27 09:05:27,038 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:05:27,039 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 31 [2018-10-27 09:05:27,039 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:05:27,040 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-10-27 09:05:27,040 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-10-27 09:05:27,040 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=361, Invalid=569, Unknown=0, NotChecked=0, Total=930 [2018-10-27 09:05:27,041 INFO L87 Difference]: Start difference. First operand 82 states and 83 transitions. Second operand 18 states. [2018-10-27 09:05:27,255 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:05:27,255 INFO L93 Difference]: Finished difference Result 139 states and 144 transitions. [2018-10-27 09:05:27,256 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-10-27 09:05:27,256 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 81 [2018-10-27 09:05:27,256 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:05:27,257 INFO L225 Difference]: With dead ends: 139 [2018-10-27 09:05:27,258 INFO L226 Difference]: Without dead ends: 96 [2018-10-27 09:05:27,259 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 177 GetRequests, 147 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 134 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=367, Invalid=625, Unknown=0, NotChecked=0, Total=992 [2018-10-27 09:05:27,260 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2018-10-27 09:05:27,264 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 94. [2018-10-27 09:05:27,264 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 94 states. [2018-10-27 09:05:27,264 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 95 transitions. [2018-10-27 09:05:27,265 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 95 transitions. Word has length 81 [2018-10-27 09:05:27,265 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:05:27,265 INFO L481 AbstractCegarLoop]: Abstraction has 94 states and 95 transitions. [2018-10-27 09:05:27,265 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-10-27 09:05:27,265 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 95 transitions. [2018-10-27 09:05:27,268 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2018-10-27 09:05:27,268 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:05:27,269 INFO L375 BasicCegarLoop]: trace histogram [14, 14, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:05:27,269 INFO L424 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:05:27,269 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:05:27,269 INFO L82 PathProgramCache]: Analyzing trace with hash 773593207, now seen corresponding path program 12 times [2018-10-27 09:05:27,269 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:05:27,270 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:05:27,270 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:05:27,270 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:05:27,271 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:05:27,292 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:05:27,572 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 260 trivial. 0 not checked. [2018-10-27 09:05:27,573 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:05:27,573 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:05:27,573 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:05:27,573 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:05:27,573 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:05:27,573 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:05:27,582 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 09:05:27,583 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 09:05:27,662 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 09:05:27,663 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:05:27,666 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:05:27,694 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 260 trivial. 0 not checked. [2018-10-27 09:05:27,694 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:05:28,045 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 260 trivial. 0 not checked. [2018-10-27 09:05:28,067 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:05:28,068 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 31 [2018-10-27 09:05:28,068 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:05:28,069 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-10-27 09:05:28,069 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-10-27 09:05:28,069 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=465, Invalid=465, Unknown=0, NotChecked=0, Total=930 [2018-10-27 09:05:28,070 INFO L87 Difference]: Start difference. First operand 94 states and 95 transitions. Second operand 17 states. [2018-10-27 09:05:28,223 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:05:28,223 INFO L93 Difference]: Finished difference Result 150 states and 153 transitions. [2018-10-27 09:05:28,223 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-10-27 09:05:28,224 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 93 [2018-10-27 09:05:28,224 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:05:28,225 INFO L225 Difference]: With dead ends: 150 [2018-10-27 09:05:28,225 INFO L226 Difference]: Without dead ends: 103 [2018-10-27 09:05:28,227 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 201 GetRequests, 172 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=465, Invalid=465, Unknown=0, NotChecked=0, Total=930 [2018-10-27 09:05:28,227 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2018-10-27 09:05:28,232 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 97. [2018-10-27 09:05:28,232 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 97 states. [2018-10-27 09:05:28,233 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 98 transitions. [2018-10-27 09:05:28,233 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 98 transitions. Word has length 93 [2018-10-27 09:05:28,234 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:05:28,234 INFO L481 AbstractCegarLoop]: Abstraction has 97 states and 98 transitions. [2018-10-27 09:05:28,234 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-10-27 09:05:28,234 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 98 transitions. [2018-10-27 09:05:28,235 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2018-10-27 09:05:28,235 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:05:28,236 INFO L375 BasicCegarLoop]: trace histogram [15, 14, 14, 14, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:05:28,236 INFO L424 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:05:28,236 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:05:28,236 INFO L82 PathProgramCache]: Analyzing trace with hash -1075443694, now seen corresponding path program 13 times [2018-10-27 09:05:28,237 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:05:28,238 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:05:28,238 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:05:28,238 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:05:28,238 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:05:28,260 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:05:29,333 INFO L134 CoverageAnalysis]: Checked inductivity of 561 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 260 trivial. 0 not checked. [2018-10-27 09:05:29,334 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:05:29,334 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:05:29,334 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:05:29,334 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:05:29,334 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:05:29,334 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:05:29,343 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:05:29,343 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:05:29,426 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:05:29,430 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:05:29,469 INFO L134 CoverageAnalysis]: Checked inductivity of 561 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 260 trivial. 0 not checked. [2018-10-27 09:05:29,469 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:05:29,974 INFO L134 CoverageAnalysis]: Checked inductivity of 561 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 260 trivial. 0 not checked. [2018-10-27 09:05:29,996 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:05:29,996 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 33 [2018-10-27 09:05:29,996 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:05:29,997 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-10-27 09:05:29,997 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-10-27 09:05:29,998 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=528, Invalid=528, Unknown=0, NotChecked=0, Total=1056 [2018-10-27 09:05:29,998 INFO L87 Difference]: Start difference. First operand 97 states and 98 transitions. Second operand 18 states. [2018-10-27 09:05:30,309 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:05:30,309 INFO L93 Difference]: Finished difference Result 157 states and 161 transitions. [2018-10-27 09:05:30,310 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-10-27 09:05:30,310 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 96 [2018-10-27 09:05:30,311 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:05:30,312 INFO L225 Difference]: With dead ends: 157 [2018-10-27 09:05:30,312 INFO L226 Difference]: Without dead ends: 110 [2018-10-27 09:05:30,313 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 208 GetRequests, 177 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=528, Invalid=528, Unknown=0, NotChecked=0, Total=1056 [2018-10-27 09:05:30,314 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2018-10-27 09:05:30,317 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 100. [2018-10-27 09:05:30,317 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 100 states. [2018-10-27 09:05:30,318 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 101 transitions. [2018-10-27 09:05:30,318 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 101 transitions. Word has length 96 [2018-10-27 09:05:30,318 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:05:30,318 INFO L481 AbstractCegarLoop]: Abstraction has 100 states and 101 transitions. [2018-10-27 09:05:30,319 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-10-27 09:05:30,319 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 101 transitions. [2018-10-27 09:05:30,319 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2018-10-27 09:05:30,320 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:05:30,320 INFO L375 BasicCegarLoop]: trace histogram [16, 15, 15, 14, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:05:30,320 INFO L424 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:05:30,320 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:05:30,321 INFO L82 PathProgramCache]: Analyzing trace with hash 1516777111, now seen corresponding path program 14 times [2018-10-27 09:05:30,321 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:05:30,322 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:05:30,322 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:05:30,322 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:05:30,322 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:05:30,345 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:05:30,664 INFO L134 CoverageAnalysis]: Checked inductivity of 605 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 260 trivial. 0 not checked. [2018-10-27 09:05:30,664 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:05:30,664 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:05:30,664 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:05:30,665 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:05:30,665 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:05:30,665 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:05:30,688 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 09:05:30,688 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 09:05:30,900 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 14 check-sat command(s) [2018-10-27 09:05:30,901 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:05:30,905 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:05:30,975 INFO L134 CoverageAnalysis]: Checked inductivity of 605 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 345 trivial. 0 not checked. [2018-10-27 09:05:30,975 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:05:31,484 INFO L134 CoverageAnalysis]: Checked inductivity of 605 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 345 trivial. 0 not checked. [2018-10-27 09:05:31,505 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:05:31,506 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 37 [2018-10-27 09:05:31,506 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:05:31,506 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-10-27 09:05:31,506 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-10-27 09:05:31,507 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=538, Invalid=794, Unknown=0, NotChecked=0, Total=1332 [2018-10-27 09:05:31,507 INFO L87 Difference]: Start difference. First operand 100 states and 101 transitions. Second operand 21 states. [2018-10-27 09:05:31,717 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:05:31,717 INFO L93 Difference]: Finished difference Result 166 states and 171 transitions. [2018-10-27 09:05:31,717 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-10-27 09:05:31,718 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 99 [2018-10-27 09:05:31,718 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:05:31,719 INFO L225 Difference]: With dead ends: 166 [2018-10-27 09:05:31,719 INFO L226 Difference]: Without dead ends: 114 [2018-10-27 09:05:31,721 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 216 GetRequests, 180 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 167 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=544, Invalid=862, Unknown=0, NotChecked=0, Total=1406 [2018-10-27 09:05:31,721 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2018-10-27 09:05:31,724 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 112. [2018-10-27 09:05:31,724 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 112 states. [2018-10-27 09:05:31,726 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 113 transitions. [2018-10-27 09:05:31,726 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 113 transitions. Word has length 99 [2018-10-27 09:05:31,726 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:05:31,726 INFO L481 AbstractCegarLoop]: Abstraction has 112 states and 113 transitions. [2018-10-27 09:05:31,726 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-10-27 09:05:31,727 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 113 transitions. [2018-10-27 09:05:31,727 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2018-10-27 09:05:31,727 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:05:31,727 INFO L375 BasicCegarLoop]: trace histogram [17, 17, 16, 16, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:05:31,727 INFO L424 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:05:31,728 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:05:31,728 INFO L82 PathProgramCache]: Analyzing trace with hash 280509428, now seen corresponding path program 15 times [2018-10-27 09:05:31,728 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:05:31,729 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:05:31,729 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:05:31,729 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:05:31,729 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:05:31,751 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:05:32,735 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 392 trivial. 0 not checked. [2018-10-27 09:05:32,735 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:05:32,735 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:05:32,735 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:05:32,735 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:05:32,735 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:05:32,736 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:05:32,743 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 09:05:32,743 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 09:05:32,821 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 09:05:32,821 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:05:32,825 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:05:32,855 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 392 trivial. 0 not checked. [2018-10-27 09:05:32,856 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:05:33,626 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 392 trivial. 0 not checked. [2018-10-27 09:05:33,647 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:05:33,647 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 37 [2018-10-27 09:05:33,647 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:05:33,647 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-10-27 09:05:33,648 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-10-27 09:05:33,648 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=666, Invalid=666, Unknown=0, NotChecked=0, Total=1332 [2018-10-27 09:05:33,648 INFO L87 Difference]: Start difference. First operand 112 states and 113 transitions. Second operand 20 states. [2018-10-27 09:05:33,842 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:05:33,842 INFO L93 Difference]: Finished difference Result 177 states and 180 transitions. [2018-10-27 09:05:33,843 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-10-27 09:05:33,843 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 111 [2018-10-27 09:05:33,843 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:05:33,844 INFO L225 Difference]: With dead ends: 177 [2018-10-27 09:05:33,844 INFO L226 Difference]: Without dead ends: 121 [2018-10-27 09:05:33,845 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 240 GetRequests, 205 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 64 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=666, Invalid=666, Unknown=0, NotChecked=0, Total=1332 [2018-10-27 09:05:33,845 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 121 states. [2018-10-27 09:05:33,848 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 121 to 115. [2018-10-27 09:05:33,848 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 115 states. [2018-10-27 09:05:33,849 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 116 transitions. [2018-10-27 09:05:33,849 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 116 transitions. Word has length 111 [2018-10-27 09:05:33,849 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:05:33,849 INFO L481 AbstractCegarLoop]: Abstraction has 115 states and 116 transitions. [2018-10-27 09:05:33,849 INFO L482 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-10-27 09:05:33,849 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 116 transitions. [2018-10-27 09:05:33,850 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2018-10-27 09:05:33,850 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:05:33,850 INFO L375 BasicCegarLoop]: trace histogram [18, 17, 17, 17, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:05:33,851 INFO L424 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:05:33,851 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:05:33,851 INFO L82 PathProgramCache]: Analyzing trace with hash -1179804977, now seen corresponding path program 16 times [2018-10-27 09:05:33,851 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:05:33,852 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:05:33,852 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:05:33,852 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:05:33,852 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:05:33,872 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:05:34,221 INFO L134 CoverageAnalysis]: Checked inductivity of 834 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 392 trivial. 0 not checked. [2018-10-27 09:05:34,221 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:05:34,221 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:05:34,222 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:05:34,222 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:05:34,222 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:05:34,222 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:05:34,229 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:05:34,230 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:05:34,314 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:05:34,318 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:05:34,339 INFO L134 CoverageAnalysis]: Checked inductivity of 834 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 392 trivial. 0 not checked. [2018-10-27 09:05:34,339 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:05:35,066 INFO L134 CoverageAnalysis]: Checked inductivity of 834 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 392 trivial. 0 not checked. [2018-10-27 09:05:35,086 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:05:35,087 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 39 [2018-10-27 09:05:35,087 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:05:35,087 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-10-27 09:05:35,087 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-10-27 09:05:35,088 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=741, Invalid=741, Unknown=0, NotChecked=0, Total=1482 [2018-10-27 09:05:35,088 INFO L87 Difference]: Start difference. First operand 115 states and 116 transitions. Second operand 21 states. [2018-10-27 09:05:35,275 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:05:35,276 INFO L93 Difference]: Finished difference Result 184 states and 188 transitions. [2018-10-27 09:05:35,276 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-10-27 09:05:35,276 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 114 [2018-10-27 09:05:35,277 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:05:35,278 INFO L225 Difference]: With dead ends: 184 [2018-10-27 09:05:35,278 INFO L226 Difference]: Without dead ends: 128 [2018-10-27 09:05:35,280 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 247 GetRequests, 210 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 68 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=741, Invalid=741, Unknown=0, NotChecked=0, Total=1482 [2018-10-27 09:05:35,280 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2018-10-27 09:05:35,283 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 118. [2018-10-27 09:05:35,283 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 118 states. [2018-10-27 09:05:35,284 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 119 transitions. [2018-10-27 09:05:35,284 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 119 transitions. Word has length 114 [2018-10-27 09:05:35,284 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:05:35,285 INFO L481 AbstractCegarLoop]: Abstraction has 118 states and 119 transitions. [2018-10-27 09:05:35,285 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-10-27 09:05:35,285 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 119 transitions. [2018-10-27 09:05:35,285 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2018-10-27 09:05:35,285 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:05:35,286 INFO L375 BasicCegarLoop]: trace histogram [19, 18, 18, 17, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:05:35,286 INFO L424 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:05:35,286 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:05:35,286 INFO L82 PathProgramCache]: Analyzing trace with hash -1682503148, now seen corresponding path program 17 times [2018-10-27 09:05:35,286 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:05:35,287 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:05:35,287 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:05:35,287 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:05:35,287 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:05:35,307 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:05:35,632 INFO L134 CoverageAnalysis]: Checked inductivity of 887 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 392 trivial. 0 not checked. [2018-10-27 09:05:35,632 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:05:35,632 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:05:35,633 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:05:35,633 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:05:35,633 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:05:35,633 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:05:35,642 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 09:05:35,642 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 09:05:35,878 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 17 check-sat command(s) [2018-10-27 09:05:35,878 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:05:35,882 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:05:35,938 INFO L134 CoverageAnalysis]: Checked inductivity of 887 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 495 trivial. 0 not checked. [2018-10-27 09:05:35,938 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:05:36,416 INFO L134 CoverageAnalysis]: Checked inductivity of 887 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 495 trivial. 0 not checked. [2018-10-27 09:05:36,438 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:05:36,438 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 43 [2018-10-27 09:05:36,439 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:05:36,439 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-10-27 09:05:36,440 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-10-27 09:05:36,440 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=751, Invalid=1055, Unknown=0, NotChecked=0, Total=1806 [2018-10-27 09:05:36,441 INFO L87 Difference]: Start difference. First operand 118 states and 119 transitions. Second operand 24 states. [2018-10-27 09:05:36,701 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:05:36,701 INFO L93 Difference]: Finished difference Result 193 states and 198 transitions. [2018-10-27 09:05:36,707 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-10-27 09:05:36,707 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 117 [2018-10-27 09:05:36,707 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:05:36,708 INFO L225 Difference]: With dead ends: 193 [2018-10-27 09:05:36,708 INFO L226 Difference]: Without dead ends: 132 [2018-10-27 09:05:36,709 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 255 GetRequests, 213 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 200 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=757, Invalid=1135, Unknown=0, NotChecked=0, Total=1892 [2018-10-27 09:05:36,710 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 132 states. [2018-10-27 09:05:36,713 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 132 to 130. [2018-10-27 09:05:36,713 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 130 states. [2018-10-27 09:05:36,714 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 130 states to 130 states and 131 transitions. [2018-10-27 09:05:36,714 INFO L78 Accepts]: Start accepts. Automaton has 130 states and 131 transitions. Word has length 117 [2018-10-27 09:05:36,714 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:05:36,714 INFO L481 AbstractCegarLoop]: Abstraction has 130 states and 131 transitions. [2018-10-27 09:05:36,714 INFO L482 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-10-27 09:05:36,715 INFO L276 IsEmpty]: Start isEmpty. Operand 130 states and 131 transitions. [2018-10-27 09:05:36,715 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2018-10-27 09:05:36,716 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:05:36,716 INFO L375 BasicCegarLoop]: trace histogram [20, 20, 19, 19, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:05:36,716 INFO L424 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:05:36,716 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:05:36,716 INFO L82 PathProgramCache]: Analyzing trace with hash 1944856023, now seen corresponding path program 18 times [2018-10-27 09:05:36,717 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:05:36,717 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:05:36,717 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:05:36,718 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:05:36,718 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:05:36,741 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:05:37,240 INFO L134 CoverageAnalysis]: Checked inductivity of 1102 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 551 trivial. 0 not checked. [2018-10-27 09:05:37,240 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:05:37,240 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:05:37,240 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:05:37,240 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:05:37,240 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:05:37,241 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:05:37,256 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 09:05:37,256 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 09:05:37,349 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 09:05:37,349 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:05:37,353 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:05:37,374 INFO L134 CoverageAnalysis]: Checked inductivity of 1102 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 551 trivial. 0 not checked. [2018-10-27 09:05:37,374 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:05:38,095 INFO L134 CoverageAnalysis]: Checked inductivity of 1102 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 551 trivial. 0 not checked. [2018-10-27 09:05:38,116 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:05:38,116 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22] total 43 [2018-10-27 09:05:38,116 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:05:38,116 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-10-27 09:05:38,117 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-10-27 09:05:38,117 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=903, Invalid=903, Unknown=0, NotChecked=0, Total=1806 [2018-10-27 09:05:38,117 INFO L87 Difference]: Start difference. First operand 130 states and 131 transitions. Second operand 23 states. [2018-10-27 09:05:38,447 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:05:38,448 INFO L93 Difference]: Finished difference Result 204 states and 207 transitions. [2018-10-27 09:05:38,456 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-10-27 09:05:38,456 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 129 [2018-10-27 09:05:38,456 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:05:38,457 INFO L225 Difference]: With dead ends: 204 [2018-10-27 09:05:38,457 INFO L226 Difference]: Without dead ends: 139 [2018-10-27 09:05:38,458 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 279 GetRequests, 238 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 76 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=903, Invalid=903, Unknown=0, NotChecked=0, Total=1806 [2018-10-27 09:05:38,458 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 139 states. [2018-10-27 09:05:38,461 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 139 to 133. [2018-10-27 09:05:38,462 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 133 states. [2018-10-27 09:05:38,462 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 134 transitions. [2018-10-27 09:05:38,462 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 134 transitions. Word has length 129 [2018-10-27 09:05:38,463 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:05:38,463 INFO L481 AbstractCegarLoop]: Abstraction has 133 states and 134 transitions. [2018-10-27 09:05:38,463 INFO L482 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-10-27 09:05:38,463 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 134 transitions. [2018-10-27 09:05:38,463 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 133 [2018-10-27 09:05:38,463 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:05:38,464 INFO L375 BasicCegarLoop]: trace histogram [21, 20, 20, 20, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:05:38,464 INFO L424 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:05:38,464 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:05:38,464 INFO L82 PathProgramCache]: Analyzing trace with hash 709338098, now seen corresponding path program 19 times [2018-10-27 09:05:38,464 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:05:38,465 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:05:38,465 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:05:38,465 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:05:38,465 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:05:38,486 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:05:40,028 INFO L134 CoverageAnalysis]: Checked inductivity of 1161 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 551 trivial. 0 not checked. [2018-10-27 09:05:40,028 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:05:40,028 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:05:40,029 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:05:40,029 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:05:40,029 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:05:40,029 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:05:40,037 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:05:40,037 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:05:40,135 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:05:40,139 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:05:40,169 INFO L134 CoverageAnalysis]: Checked inductivity of 1161 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 551 trivial. 0 not checked. [2018-10-27 09:05:40,169 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:05:40,670 INFO L134 CoverageAnalysis]: Checked inductivity of 1161 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 551 trivial. 0 not checked. [2018-10-27 09:05:40,691 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:05:40,691 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 45 [2018-10-27 09:05:40,691 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:05:40,692 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-10-27 09:05:40,692 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-10-27 09:05:40,693 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=990, Invalid=990, Unknown=0, NotChecked=0, Total=1980 [2018-10-27 09:05:40,693 INFO L87 Difference]: Start difference. First operand 133 states and 134 transitions. Second operand 24 states. [2018-10-27 09:05:40,893 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:05:40,893 INFO L93 Difference]: Finished difference Result 211 states and 215 transitions. [2018-10-27 09:05:40,894 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-10-27 09:05:40,894 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 132 [2018-10-27 09:05:40,894 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:05:40,895 INFO L225 Difference]: With dead ends: 211 [2018-10-27 09:05:40,895 INFO L226 Difference]: Without dead ends: 146 [2018-10-27 09:05:40,897 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 286 GetRequests, 243 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 80 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=990, Invalid=990, Unknown=0, NotChecked=0, Total=1980 [2018-10-27 09:05:40,897 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 146 states. [2018-10-27 09:05:40,901 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 146 to 136. [2018-10-27 09:05:40,901 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 136 states. [2018-10-27 09:05:40,902 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 137 transitions. [2018-10-27 09:05:40,902 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 137 transitions. Word has length 132 [2018-10-27 09:05:40,902 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:05:40,902 INFO L481 AbstractCegarLoop]: Abstraction has 136 states and 137 transitions. [2018-10-27 09:05:40,902 INFO L482 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-10-27 09:05:40,902 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 137 transitions. [2018-10-27 09:05:40,903 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2018-10-27 09:05:40,903 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:05:40,903 INFO L375 BasicCegarLoop]: trace histogram [22, 21, 21, 20, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:05:40,904 INFO L424 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:05:40,904 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:05:40,904 INFO L82 PathProgramCache]: Analyzing trace with hash 1264561143, now seen corresponding path program 20 times [2018-10-27 09:05:40,904 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:05:40,905 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:05:40,905 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:05:40,905 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:05:40,905 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:05:40,927 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:05:41,214 INFO L134 CoverageAnalysis]: Checked inductivity of 1223 backedges. 0 proven. 672 refuted. 0 times theorem prover too weak. 551 trivial. 0 not checked. [2018-10-27 09:05:41,214 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:05:41,214 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:05:41,214 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:05:41,215 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:05:41,215 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:05:41,215 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:05:41,224 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 09:05:41,224 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 09:05:41,715 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 20 check-sat command(s) [2018-10-27 09:05:41,715 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:05:41,721 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:05:41,841 INFO L134 CoverageAnalysis]: Checked inductivity of 1223 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 672 trivial. 0 not checked. [2018-10-27 09:05:41,841 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:05:42,376 INFO L134 CoverageAnalysis]: Checked inductivity of 1223 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 672 trivial. 0 not checked. [2018-10-27 09:05:42,398 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:05:42,398 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 49 [2018-10-27 09:05:42,398 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:05:42,399 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2018-10-27 09:05:42,399 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2018-10-27 09:05:42,400 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1000, Invalid=1352, Unknown=0, NotChecked=0, Total=2352 [2018-10-27 09:05:42,400 INFO L87 Difference]: Start difference. First operand 136 states and 137 transitions. Second operand 27 states. [2018-10-27 09:05:42,786 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:05:42,787 INFO L93 Difference]: Finished difference Result 220 states and 225 transitions. [2018-10-27 09:05:42,787 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-10-27 09:05:42,787 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 135 [2018-10-27 09:05:42,787 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:05:42,789 INFO L225 Difference]: With dead ends: 220 [2018-10-27 09:05:42,789 INFO L226 Difference]: Without dead ends: 150 [2018-10-27 09:05:42,791 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 294 GetRequests, 246 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 233 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=1006, Invalid=1444, Unknown=0, NotChecked=0, Total=2450 [2018-10-27 09:05:42,792 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 150 states. [2018-10-27 09:05:42,795 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 150 to 148. [2018-10-27 09:05:42,795 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 148 states. [2018-10-27 09:05:42,796 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 148 states to 148 states and 149 transitions. [2018-10-27 09:05:42,796 INFO L78 Accepts]: Start accepts. Automaton has 148 states and 149 transitions. Word has length 135 [2018-10-27 09:05:42,797 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:05:42,797 INFO L481 AbstractCegarLoop]: Abstraction has 148 states and 149 transitions. [2018-10-27 09:05:42,797 INFO L482 AbstractCegarLoop]: Interpolant automaton has 27 states. [2018-10-27 09:05:42,797 INFO L276 IsEmpty]: Start isEmpty. Operand 148 states and 149 transitions. [2018-10-27 09:05:42,798 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 148 [2018-10-27 09:05:42,798 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:05:42,798 INFO L375 BasicCegarLoop]: trace histogram [23, 23, 22, 22, 22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:05:42,798 INFO L424 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:05:42,798 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:05:42,799 INFO L82 PathProgramCache]: Analyzing trace with hash 1991732244, now seen corresponding path program 21 times [2018-10-27 09:05:42,799 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:05:42,799 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:05:42,799 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:05:42,800 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:05:42,800 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:05:42,843 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:05:43,610 INFO L134 CoverageAnalysis]: Checked inductivity of 1474 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 737 trivial. 0 not checked. [2018-10-27 09:05:43,610 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:05:43,610 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:05:43,610 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:05:43,610 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:05:43,610 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:05:43,610 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:05:43,618 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 09:05:43,618 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 09:05:43,724 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 09:05:43,725 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:05:43,729 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:05:43,777 INFO L134 CoverageAnalysis]: Checked inductivity of 1474 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 737 trivial. 0 not checked. [2018-10-27 09:05:43,777 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:05:44,366 INFO L134 CoverageAnalysis]: Checked inductivity of 1474 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 737 trivial. 0 not checked. [2018-10-27 09:05:44,387 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:05:44,387 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 49 [2018-10-27 09:05:44,387 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:05:44,388 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-10-27 09:05:44,388 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-10-27 09:05:44,389 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1176, Invalid=1176, Unknown=0, NotChecked=0, Total=2352 [2018-10-27 09:05:44,389 INFO L87 Difference]: Start difference. First operand 148 states and 149 transitions. Second operand 26 states. [2018-10-27 09:05:44,708 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:05:44,708 INFO L93 Difference]: Finished difference Result 231 states and 234 transitions. [2018-10-27 09:05:44,708 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-10-27 09:05:44,709 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 147 [2018-10-27 09:05:44,709 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:05:44,710 INFO L225 Difference]: With dead ends: 231 [2018-10-27 09:05:44,710 INFO L226 Difference]: Without dead ends: 157 [2018-10-27 09:05:44,712 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 318 GetRequests, 271 SyntacticMatches, 0 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 88 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=1176, Invalid=1176, Unknown=0, NotChecked=0, Total=2352 [2018-10-27 09:05:44,712 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 157 states. [2018-10-27 09:05:44,715 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 157 to 151. [2018-10-27 09:05:44,715 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 151 states. [2018-10-27 09:05:44,716 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 151 states to 151 states and 152 transitions. [2018-10-27 09:05:44,716 INFO L78 Accepts]: Start accepts. Automaton has 151 states and 152 transitions. Word has length 147 [2018-10-27 09:05:44,717 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:05:44,717 INFO L481 AbstractCegarLoop]: Abstraction has 151 states and 152 transitions. [2018-10-27 09:05:44,717 INFO L482 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-10-27 09:05:44,717 INFO L276 IsEmpty]: Start isEmpty. Operand 151 states and 152 transitions. [2018-10-27 09:05:44,718 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 151 [2018-10-27 09:05:44,718 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:05:44,718 INFO L375 BasicCegarLoop]: trace histogram [24, 23, 23, 23, 22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:05:44,718 INFO L424 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:05:44,718 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:05:44,719 INFO L82 PathProgramCache]: Analyzing trace with hash -110642833, now seen corresponding path program 22 times [2018-10-27 09:05:44,719 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:05:44,719 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:05:44,720 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:05:44,720 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:05:44,720 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:05:44,743 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:05:45,108 INFO L134 CoverageAnalysis]: Checked inductivity of 1542 backedges. 0 proven. 805 refuted. 0 times theorem prover too weak. 737 trivial. 0 not checked. [2018-10-27 09:05:45,108 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:05:45,108 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:05:45,109 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:05:45,109 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:05:45,109 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:05:45,109 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:05:45,120 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:05:45,120 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:05:45,227 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:05:45,231 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:05:45,259 INFO L134 CoverageAnalysis]: Checked inductivity of 1542 backedges. 0 proven. 805 refuted. 0 times theorem prover too weak. 737 trivial. 0 not checked. [2018-10-27 09:05:45,260 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:05:45,929 INFO L134 CoverageAnalysis]: Checked inductivity of 1542 backedges. 0 proven. 805 refuted. 0 times theorem prover too weak. 737 trivial. 0 not checked. [2018-10-27 09:05:45,949 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:05:45,949 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 51 [2018-10-27 09:05:45,950 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:05:45,950 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2018-10-27 09:05:45,950 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2018-10-27 09:05:45,951 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1275, Invalid=1275, Unknown=0, NotChecked=0, Total=2550 [2018-10-27 09:05:45,952 INFO L87 Difference]: Start difference. First operand 151 states and 152 transitions. Second operand 27 states. [2018-10-27 09:05:46,197 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:05:46,197 INFO L93 Difference]: Finished difference Result 238 states and 242 transitions. [2018-10-27 09:05:46,198 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-10-27 09:05:46,198 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 150 [2018-10-27 09:05:46,199 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:05:46,200 INFO L225 Difference]: With dead ends: 238 [2018-10-27 09:05:46,200 INFO L226 Difference]: Without dead ends: 164 [2018-10-27 09:05:46,201 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 325 GetRequests, 276 SyntacticMatches, 0 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 92 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=1275, Invalid=1275, Unknown=0, NotChecked=0, Total=2550 [2018-10-27 09:05:46,202 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 164 states. [2018-10-27 09:05:46,205 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 164 to 154. [2018-10-27 09:05:46,206 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 154 states. [2018-10-27 09:05:46,206 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 154 states to 154 states and 155 transitions. [2018-10-27 09:05:46,207 INFO L78 Accepts]: Start accepts. Automaton has 154 states and 155 transitions. Word has length 150 [2018-10-27 09:05:46,207 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:05:46,207 INFO L481 AbstractCegarLoop]: Abstraction has 154 states and 155 transitions. [2018-10-27 09:05:46,207 INFO L482 AbstractCegarLoop]: Interpolant automaton has 27 states. [2018-10-27 09:05:46,207 INFO L276 IsEmpty]: Start isEmpty. Operand 154 states and 155 transitions. [2018-10-27 09:05:46,208 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 154 [2018-10-27 09:05:46,208 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:05:46,208 INFO L375 BasicCegarLoop]: trace histogram [25, 24, 24, 23, 22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:05:46,209 INFO L424 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:05:46,209 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:05:46,209 INFO L82 PathProgramCache]: Analyzing trace with hash 1541515828, now seen corresponding path program 23 times [2018-10-27 09:05:46,209 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:05:46,210 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:05:46,210 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:05:46,210 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:05:46,210 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:05:46,234 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:05:47,238 INFO L134 CoverageAnalysis]: Checked inductivity of 1613 backedges. 0 proven. 876 refuted. 0 times theorem prover too weak. 737 trivial. 0 not checked. [2018-10-27 09:05:47,238 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:05:47,238 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:05:47,239 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:05:47,239 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:05:47,239 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:05:47,239 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:05:47,247 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 09:05:47,247 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 09:05:47,988 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 23 check-sat command(s) [2018-10-27 09:05:47,988 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:05:47,993 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:05:48,068 INFO L134 CoverageAnalysis]: Checked inductivity of 1613 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 876 trivial. 0 not checked. [2018-10-27 09:05:48,069 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:05:49,100 INFO L134 CoverageAnalysis]: Checked inductivity of 1613 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 876 trivial. 0 not checked. [2018-10-27 09:05:49,121 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:05:49,122 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 55 [2018-10-27 09:05:49,122 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:05:49,122 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2018-10-27 09:05:49,123 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2018-10-27 09:05:49,123 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1285, Invalid=1685, Unknown=0, NotChecked=0, Total=2970 [2018-10-27 09:05:49,124 INFO L87 Difference]: Start difference. First operand 154 states and 155 transitions. Second operand 30 states. [2018-10-27 09:05:50,497 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:05:50,498 INFO L93 Difference]: Finished difference Result 247 states and 252 transitions. [2018-10-27 09:05:50,498 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2018-10-27 09:05:50,498 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 153 [2018-10-27 09:05:50,498 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:05:50,500 INFO L225 Difference]: With dead ends: 247 [2018-10-27 09:05:50,500 INFO L226 Difference]: Without dead ends: 168 [2018-10-27 09:05:50,502 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 333 GetRequests, 279 SyntacticMatches, 0 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 266 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=1291, Invalid=1789, Unknown=0, NotChecked=0, Total=3080 [2018-10-27 09:05:50,502 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 168 states. [2018-10-27 09:05:50,504 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 168 to 166. [2018-10-27 09:05:50,504 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 166 states. [2018-10-27 09:05:50,505 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 166 states to 166 states and 167 transitions. [2018-10-27 09:05:50,505 INFO L78 Accepts]: Start accepts. Automaton has 166 states and 167 transitions. Word has length 153 [2018-10-27 09:05:50,505 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:05:50,505 INFO L481 AbstractCegarLoop]: Abstraction has 166 states and 167 transitions. [2018-10-27 09:05:50,506 INFO L482 AbstractCegarLoop]: Interpolant automaton has 30 states. [2018-10-27 09:05:50,506 INFO L276 IsEmpty]: Start isEmpty. Operand 166 states and 167 transitions. [2018-10-27 09:05:50,506 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 166 [2018-10-27 09:05:50,507 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:05:50,507 INFO L375 BasicCegarLoop]: trace histogram [26, 26, 25, 25, 25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:05:50,507 INFO L424 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:05:50,507 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:05:50,507 INFO L82 PathProgramCache]: Analyzing trace with hash 1394469687, now seen corresponding path program 24 times [2018-10-27 09:05:50,507 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:05:50,508 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:05:50,508 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:05:50,508 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:05:50,508 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:05:50,541 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:05:50,995 INFO L134 CoverageAnalysis]: Checked inductivity of 1900 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 950 trivial. 0 not checked. [2018-10-27 09:05:50,995 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:05:50,995 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:05:50,995 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:05:50,995 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:05:50,995 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:05:50,996 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:05:51,004 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 09:05:51,004 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 09:05:51,125 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 09:05:51,126 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:05:51,131 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:05:51,246 INFO L134 CoverageAnalysis]: Checked inductivity of 1900 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 950 trivial. 0 not checked. [2018-10-27 09:05:51,247 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:05:53,375 INFO L134 CoverageAnalysis]: Checked inductivity of 1900 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 950 trivial. 0 not checked. [2018-10-27 09:05:53,397 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:05:53,397 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 55 [2018-10-27 09:05:53,397 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:05:53,397 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2018-10-27 09:05:53,398 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2018-10-27 09:05:53,399 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1485, Invalid=1485, Unknown=0, NotChecked=0, Total=2970 [2018-10-27 09:05:53,399 INFO L87 Difference]: Start difference. First operand 166 states and 167 transitions. Second operand 29 states. [2018-10-27 09:05:53,648 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:05:53,648 INFO L93 Difference]: Finished difference Result 258 states and 261 transitions. [2018-10-27 09:05:53,648 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-10-27 09:05:53,649 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 165 [2018-10-27 09:05:53,649 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:05:53,650 INFO L225 Difference]: With dead ends: 258 [2018-10-27 09:05:53,650 INFO L226 Difference]: Without dead ends: 175 [2018-10-27 09:05:53,651 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 357 GetRequests, 304 SyntacticMatches, 0 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 100 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=1485, Invalid=1485, Unknown=0, NotChecked=0, Total=2970 [2018-10-27 09:05:53,651 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 175 states. [2018-10-27 09:05:53,655 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 175 to 169. [2018-10-27 09:05:53,655 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 169 states. [2018-10-27 09:05:53,656 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 169 states to 169 states and 170 transitions. [2018-10-27 09:05:53,656 INFO L78 Accepts]: Start accepts. Automaton has 169 states and 170 transitions. Word has length 165 [2018-10-27 09:05:53,656 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:05:53,656 INFO L481 AbstractCegarLoop]: Abstraction has 169 states and 170 transitions. [2018-10-27 09:05:53,657 INFO L482 AbstractCegarLoop]: Interpolant automaton has 29 states. [2018-10-27 09:05:53,657 INFO L276 IsEmpty]: Start isEmpty. Operand 169 states and 170 transitions. [2018-10-27 09:05:53,657 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 169 [2018-10-27 09:05:53,658 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:05:53,658 INFO L375 BasicCegarLoop]: trace histogram [27, 26, 26, 26, 25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:05:53,658 INFO L424 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:05:53,658 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:05:53,658 INFO L82 PathProgramCache]: Analyzing trace with hash -456804398, now seen corresponding path program 25 times [2018-10-27 09:05:53,659 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:05:53,659 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:05:53,659 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:05:53,659 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:05:53,660 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:05:53,685 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:05:54,091 INFO L134 CoverageAnalysis]: Checked inductivity of 1977 backedges. 0 proven. 1027 refuted. 0 times theorem prover too weak. 950 trivial. 0 not checked. [2018-10-27 09:05:54,092 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:05:54,092 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:05:54,092 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:05:54,092 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:05:54,092 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:05:54,092 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:05:54,101 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:05:54,101 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:05:54,223 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:05:54,228 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:05:54,271 INFO L134 CoverageAnalysis]: Checked inductivity of 1977 backedges. 0 proven. 1027 refuted. 0 times theorem prover too weak. 950 trivial. 0 not checked. [2018-10-27 09:05:54,271 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:05:55,246 INFO L134 CoverageAnalysis]: Checked inductivity of 1977 backedges. 0 proven. 1027 refuted. 0 times theorem prover too weak. 950 trivial. 0 not checked. [2018-10-27 09:05:55,267 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:05:55,267 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 57 [2018-10-27 09:05:55,267 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:05:55,268 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2018-10-27 09:05:55,268 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2018-10-27 09:05:55,269 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1596, Invalid=1596, Unknown=0, NotChecked=0, Total=3192 [2018-10-27 09:05:55,269 INFO L87 Difference]: Start difference. First operand 169 states and 170 transitions. Second operand 30 states. [2018-10-27 09:05:55,701 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:05:55,702 INFO L93 Difference]: Finished difference Result 265 states and 269 transitions. [2018-10-27 09:05:55,702 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2018-10-27 09:05:55,702 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 168 [2018-10-27 09:05:55,703 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:05:55,704 INFO L225 Difference]: With dead ends: 265 [2018-10-27 09:05:55,704 INFO L226 Difference]: Without dead ends: 182 [2018-10-27 09:05:55,708 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 364 GetRequests, 309 SyntacticMatches, 0 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 104 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=1596, Invalid=1596, Unknown=0, NotChecked=0, Total=3192 [2018-10-27 09:05:55,708 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 182 states. [2018-10-27 09:05:55,711 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 182 to 172. [2018-10-27 09:05:55,712 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 172 states. [2018-10-27 09:05:55,712 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 172 states to 172 states and 173 transitions. [2018-10-27 09:05:55,713 INFO L78 Accepts]: Start accepts. Automaton has 172 states and 173 transitions. Word has length 168 [2018-10-27 09:05:55,713 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:05:55,713 INFO L481 AbstractCegarLoop]: Abstraction has 172 states and 173 transitions. [2018-10-27 09:05:55,713 INFO L482 AbstractCegarLoop]: Interpolant automaton has 30 states. [2018-10-27 09:05:55,713 INFO L276 IsEmpty]: Start isEmpty. Operand 172 states and 173 transitions. [2018-10-27 09:05:55,714 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 172 [2018-10-27 09:05:55,714 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:05:55,714 INFO L375 BasicCegarLoop]: trace histogram [28, 27, 27, 26, 25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:05:55,715 INFO L424 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:05:55,715 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:05:55,715 INFO L82 PathProgramCache]: Analyzing trace with hash -88022697, now seen corresponding path program 26 times [2018-10-27 09:05:55,715 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:05:55,716 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:05:55,716 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:05:55,716 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:05:55,716 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:05:55,742 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:05:56,208 INFO L134 CoverageAnalysis]: Checked inductivity of 2057 backedges. 0 proven. 1107 refuted. 0 times theorem prover too weak. 950 trivial. 0 not checked. [2018-10-27 09:05:56,208 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:05:56,208 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:05:56,208 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:05:56,208 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:05:56,208 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:05:56,209 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:05:56,217 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 09:05:56,217 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 09:05:57,435 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 26 check-sat command(s) [2018-10-27 09:05:57,435 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:05:57,441 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:05:58,286 INFO L134 CoverageAnalysis]: Checked inductivity of 2057 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 1107 trivial. 0 not checked. [2018-10-27 09:05:58,286 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:05:59,800 INFO L134 CoverageAnalysis]: Checked inductivity of 2057 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 1107 trivial. 0 not checked. [2018-10-27 09:05:59,822 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:05:59,822 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30] total 61 [2018-10-27 09:05:59,822 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:05:59,822 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2018-10-27 09:05:59,823 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2018-10-27 09:05:59,823 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1606, Invalid=2054, Unknown=0, NotChecked=0, Total=3660 [2018-10-27 09:05:59,823 INFO L87 Difference]: Start difference. First operand 172 states and 173 transitions. Second operand 33 states. [2018-10-27 09:06:00,154 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:06:00,154 INFO L93 Difference]: Finished difference Result 274 states and 279 transitions. [2018-10-27 09:06:00,155 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2018-10-27 09:06:00,155 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 171 [2018-10-27 09:06:00,155 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:06:00,156 INFO L225 Difference]: With dead ends: 274 [2018-10-27 09:06:00,156 INFO L226 Difference]: Without dead ends: 186 [2018-10-27 09:06:00,159 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 372 GetRequests, 312 SyntacticMatches, 0 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 299 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=1612, Invalid=2170, Unknown=0, NotChecked=0, Total=3782 [2018-10-27 09:06:00,159 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 186 states. [2018-10-27 09:06:00,164 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 186 to 184. [2018-10-27 09:06:00,164 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 184 states. [2018-10-27 09:06:00,165 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 184 states to 184 states and 185 transitions. [2018-10-27 09:06:00,165 INFO L78 Accepts]: Start accepts. Automaton has 184 states and 185 transitions. Word has length 171 [2018-10-27 09:06:00,166 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:06:00,166 INFO L481 AbstractCegarLoop]: Abstraction has 184 states and 185 transitions. [2018-10-27 09:06:00,166 INFO L482 AbstractCegarLoop]: Interpolant automaton has 33 states. [2018-10-27 09:06:00,166 INFO L276 IsEmpty]: Start isEmpty. Operand 184 states and 185 transitions. [2018-10-27 09:06:00,167 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 184 [2018-10-27 09:06:00,167 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:06:00,167 INFO L375 BasicCegarLoop]: trace histogram [29, 29, 28, 28, 28, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:06:00,167 INFO L424 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:06:00,167 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:06:00,168 INFO L82 PathProgramCache]: Analyzing trace with hash 841557044, now seen corresponding path program 27 times [2018-10-27 09:06:00,168 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:06:00,168 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:06:00,169 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:06:00,169 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:06:00,169 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:06:00,199 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:06:00,798 INFO L134 CoverageAnalysis]: Checked inductivity of 2380 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 1190 trivial. 0 not checked. [2018-10-27 09:06:00,798 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:06:00,798 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:06:00,798 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:06:00,798 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:06:00,798 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:06:00,798 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:06:00,806 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 09:06:00,806 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 09:06:00,945 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 09:06:00,945 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:06:00,950 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:06:00,999 INFO L134 CoverageAnalysis]: Checked inductivity of 2380 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 1190 trivial. 0 not checked. [2018-10-27 09:06:01,000 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:06:01,929 INFO L134 CoverageAnalysis]: Checked inductivity of 2380 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 1190 trivial. 0 not checked. [2018-10-27 09:06:01,950 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:06:01,951 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31, 31] total 61 [2018-10-27 09:06:01,951 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:06:01,951 INFO L460 AbstractCegarLoop]: Interpolant automaton has 32 states [2018-10-27 09:06:01,952 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2018-10-27 09:06:01,952 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1830, Invalid=1830, Unknown=0, NotChecked=0, Total=3660 [2018-10-27 09:06:01,952 INFO L87 Difference]: Start difference. First operand 184 states and 185 transitions. Second operand 32 states. [2018-10-27 09:06:02,273 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:06:02,273 INFO L93 Difference]: Finished difference Result 285 states and 288 transitions. [2018-10-27 09:06:02,273 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2018-10-27 09:06:02,274 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 183 [2018-10-27 09:06:02,274 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:06:02,275 INFO L225 Difference]: With dead ends: 285 [2018-10-27 09:06:02,276 INFO L226 Difference]: Without dead ends: 193 [2018-10-27 09:06:02,277 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 396 GetRequests, 337 SyntacticMatches, 0 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 112 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=1830, Invalid=1830, Unknown=0, NotChecked=0, Total=3660 [2018-10-27 09:06:02,278 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 193 states. [2018-10-27 09:06:02,281 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 193 to 187. [2018-10-27 09:06:02,281 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 187 states. [2018-10-27 09:06:02,282 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 187 states to 187 states and 188 transitions. [2018-10-27 09:06:02,282 INFO L78 Accepts]: Start accepts. Automaton has 187 states and 188 transitions. Word has length 183 [2018-10-27 09:06:02,282 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:06:02,283 INFO L481 AbstractCegarLoop]: Abstraction has 187 states and 188 transitions. [2018-10-27 09:06:02,283 INFO L482 AbstractCegarLoop]: Interpolant automaton has 32 states. [2018-10-27 09:06:02,283 INFO L276 IsEmpty]: Start isEmpty. Operand 187 states and 188 transitions. [2018-10-27 09:06:02,284 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 187 [2018-10-27 09:06:02,284 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:06:02,284 INFO L375 BasicCegarLoop]: trace histogram [30, 29, 29, 29, 28, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:06:02,284 INFO L424 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:06:02,284 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:06:02,284 INFO L82 PathProgramCache]: Analyzing trace with hash -1809899505, now seen corresponding path program 28 times [2018-10-27 09:06:02,285 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:06:02,285 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:06:02,285 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:06:02,285 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:06:02,286 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:06:02,314 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:06:03,364 INFO L134 CoverageAnalysis]: Checked inductivity of 2466 backedges. 0 proven. 1276 refuted. 0 times theorem prover too weak. 1190 trivial. 0 not checked. [2018-10-27 09:06:03,365 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:06:03,365 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:06:03,365 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:06:03,365 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:06:03,365 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:06:03,365 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:06:03,374 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:06:03,374 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:06:03,523 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:06:03,528 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:06:03,650 INFO L134 CoverageAnalysis]: Checked inductivity of 2466 backedges. 0 proven. 1276 refuted. 0 times theorem prover too weak. 1190 trivial. 0 not checked. [2018-10-27 09:06:03,651 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:06:04,629 INFO L134 CoverageAnalysis]: Checked inductivity of 2466 backedges. 0 proven. 1276 refuted. 0 times theorem prover too weak. 1190 trivial. 0 not checked. [2018-10-27 09:06:04,650 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:06:04,650 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 63 [2018-10-27 09:06:04,650 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:06:04,651 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2018-10-27 09:06:04,651 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2018-10-27 09:06:04,652 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1953, Invalid=1953, Unknown=0, NotChecked=0, Total=3906 [2018-10-27 09:06:04,652 INFO L87 Difference]: Start difference. First operand 187 states and 188 transitions. Second operand 33 states. [2018-10-27 09:06:04,949 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:06:04,949 INFO L93 Difference]: Finished difference Result 292 states and 296 transitions. [2018-10-27 09:06:04,949 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2018-10-27 09:06:04,949 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 186 [2018-10-27 09:06:04,950 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:06:04,951 INFO L225 Difference]: With dead ends: 292 [2018-10-27 09:06:04,951 INFO L226 Difference]: Without dead ends: 200 [2018-10-27 09:06:04,952 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 403 GetRequests, 342 SyntacticMatches, 0 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 116 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=1953, Invalid=1953, Unknown=0, NotChecked=0, Total=3906 [2018-10-27 09:06:04,953 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 200 states. [2018-10-27 09:06:04,957 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 200 to 190. [2018-10-27 09:06:04,957 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 190 states. [2018-10-27 09:06:04,957 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 190 states to 190 states and 191 transitions. [2018-10-27 09:06:04,958 INFO L78 Accepts]: Start accepts. Automaton has 190 states and 191 transitions. Word has length 186 [2018-10-27 09:06:04,958 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:06:04,958 INFO L481 AbstractCegarLoop]: Abstraction has 190 states and 191 transitions. [2018-10-27 09:06:04,958 INFO L482 AbstractCegarLoop]: Interpolant automaton has 33 states. [2018-10-27 09:06:04,958 INFO L276 IsEmpty]: Start isEmpty. Operand 190 states and 191 transitions. [2018-10-27 09:06:04,959 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 190 [2018-10-27 09:06:04,959 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:06:04,960 INFO L375 BasicCegarLoop]: trace histogram [31, 30, 30, 29, 28, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:06:04,960 INFO L424 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:06:04,960 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:06:04,960 INFO L82 PathProgramCache]: Analyzing trace with hash 1686557268, now seen corresponding path program 29 times [2018-10-27 09:06:04,960 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:06:04,961 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:06:04,961 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:06:04,961 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:06:04,961 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:06:04,992 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:06:05,505 INFO L134 CoverageAnalysis]: Checked inductivity of 2555 backedges. 0 proven. 1365 refuted. 0 times theorem prover too weak. 1190 trivial. 0 not checked. [2018-10-27 09:06:05,505 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:06:05,505 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:06:05,505 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:06:05,506 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:06:05,506 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:06:05,506 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:06:05,514 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 09:06:05,514 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 09:06:07,462 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 29 check-sat command(s) [2018-10-27 09:06:07,462 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:06:07,472 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:06:07,757 INFO L134 CoverageAnalysis]: Checked inductivity of 2555 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 1365 trivial. 0 not checked. [2018-10-27 09:06:07,757 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:06:09,057 INFO L134 CoverageAnalysis]: Checked inductivity of 2555 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 1365 trivial. 0 not checked. [2018-10-27 09:06:09,081 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:06:09,082 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33, 33] total 67 [2018-10-27 09:06:09,082 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:06:09,082 INFO L460 AbstractCegarLoop]: Interpolant automaton has 36 states [2018-10-27 09:06:09,083 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2018-10-27 09:06:09,083 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1963, Invalid=2459, Unknown=0, NotChecked=0, Total=4422 [2018-10-27 09:06:09,084 INFO L87 Difference]: Start difference. First operand 190 states and 191 transitions. Second operand 36 states. [2018-10-27 09:06:09,517 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:06:09,517 INFO L93 Difference]: Finished difference Result 301 states and 306 transitions. [2018-10-27 09:06:09,517 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2018-10-27 09:06:09,518 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 189 [2018-10-27 09:06:09,518 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:06:09,520 INFO L225 Difference]: With dead ends: 301 [2018-10-27 09:06:09,520 INFO L226 Difference]: Without dead ends: 204 [2018-10-27 09:06:09,522 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 411 GetRequests, 345 SyntacticMatches, 0 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 332 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=1969, Invalid=2587, Unknown=0, NotChecked=0, Total=4556 [2018-10-27 09:06:09,522 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 204 states. [2018-10-27 09:06:09,526 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 204 to 202. [2018-10-27 09:06:09,526 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 202 states. [2018-10-27 09:06:09,527 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 202 states to 202 states and 203 transitions. [2018-10-27 09:06:09,527 INFO L78 Accepts]: Start accepts. Automaton has 202 states and 203 transitions. Word has length 189 [2018-10-27 09:06:09,527 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:06:09,527 INFO L481 AbstractCegarLoop]: Abstraction has 202 states and 203 transitions. [2018-10-27 09:06:09,527 INFO L482 AbstractCegarLoop]: Interpolant automaton has 36 states. [2018-10-27 09:06:09,527 INFO L276 IsEmpty]: Start isEmpty. Operand 202 states and 203 transitions. [2018-10-27 09:06:09,528 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 202 [2018-10-27 09:06:09,528 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:06:09,529 INFO L375 BasicCegarLoop]: trace histogram [32, 32, 31, 31, 31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:06:09,529 INFO L424 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:06:09,529 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:06:09,529 INFO L82 PathProgramCache]: Analyzing trace with hash 852191383, now seen corresponding path program 30 times [2018-10-27 09:06:09,529 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:06:09,530 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:06:09,530 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:06:09,530 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:06:09,530 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:06:09,564 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:06:10,385 INFO L134 CoverageAnalysis]: Checked inductivity of 2914 backedges. 0 proven. 1457 refuted. 0 times theorem prover too weak. 1457 trivial. 0 not checked. [2018-10-27 09:06:10,385 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:06:10,385 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:06:10,386 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:06:10,386 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:06:10,386 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:06:10,386 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:06:10,393 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 09:06:10,393 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 09:06:10,554 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 09:06:10,554 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:06:10,561 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:06:10,711 INFO L134 CoverageAnalysis]: Checked inductivity of 2914 backedges. 0 proven. 1457 refuted. 0 times theorem prover too weak. 1457 trivial. 0 not checked. [2018-10-27 09:06:10,711 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:06:11,847 INFO L134 CoverageAnalysis]: Checked inductivity of 2914 backedges. 0 proven. 1457 refuted. 0 times theorem prover too weak. 1457 trivial. 0 not checked. [2018-10-27 09:06:11,880 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:06:11,880 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34, 34] total 67 [2018-10-27 09:06:11,880 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:06:11,881 INFO L460 AbstractCegarLoop]: Interpolant automaton has 35 states [2018-10-27 09:06:11,881 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2018-10-27 09:06:11,882 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2211, Invalid=2211, Unknown=0, NotChecked=0, Total=4422 [2018-10-27 09:06:11,882 INFO L87 Difference]: Start difference. First operand 202 states and 203 transitions. Second operand 35 states. [2018-10-27 09:06:12,297 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:06:12,297 INFO L93 Difference]: Finished difference Result 312 states and 315 transitions. [2018-10-27 09:06:12,297 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2018-10-27 09:06:12,298 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 201 [2018-10-27 09:06:12,298 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:06:12,300 INFO L225 Difference]: With dead ends: 312 [2018-10-27 09:06:12,300 INFO L226 Difference]: Without dead ends: 211 [2018-10-27 09:06:12,301 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 435 GetRequests, 370 SyntacticMatches, 0 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 124 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=2211, Invalid=2211, Unknown=0, NotChecked=0, Total=4422 [2018-10-27 09:06:12,301 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 211 states. [2018-10-27 09:06:12,305 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 211 to 205. [2018-10-27 09:06:12,305 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 205 states. [2018-10-27 09:06:12,306 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 205 states to 205 states and 206 transitions. [2018-10-27 09:06:12,306 INFO L78 Accepts]: Start accepts. Automaton has 205 states and 206 transitions. Word has length 201 [2018-10-27 09:06:12,306 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:06:12,306 INFO L481 AbstractCegarLoop]: Abstraction has 205 states and 206 transitions. [2018-10-27 09:06:12,306 INFO L482 AbstractCegarLoop]: Interpolant automaton has 35 states. [2018-10-27 09:06:12,306 INFO L276 IsEmpty]: Start isEmpty. Operand 205 states and 206 transitions. [2018-10-27 09:06:12,307 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 205 [2018-10-27 09:06:12,307 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:06:12,308 INFO L375 BasicCegarLoop]: trace histogram [33, 32, 32, 32, 31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:06:12,308 INFO L424 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:06:12,308 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:06:12,308 INFO L82 PathProgramCache]: Analyzing trace with hash -535149646, now seen corresponding path program 31 times [2018-10-27 09:06:12,308 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:06:12,309 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:06:12,309 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:06:12,309 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:06:12,309 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:06:12,343 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:06:13,850 INFO L134 CoverageAnalysis]: Checked inductivity of 3009 backedges. 0 proven. 1552 refuted. 0 times theorem prover too weak. 1457 trivial. 0 not checked. [2018-10-27 09:06:13,850 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:06:13,851 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:06:13,851 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:06:13,851 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:06:13,851 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:06:13,851 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:06:13,858 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:06:13,858 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:06:14,005 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:06:14,010 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:06:14,105 INFO L134 CoverageAnalysis]: Checked inductivity of 3009 backedges. 0 proven. 1552 refuted. 0 times theorem prover too weak. 1457 trivial. 0 not checked. [2018-10-27 09:06:14,105 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:06:15,330 INFO L134 CoverageAnalysis]: Checked inductivity of 3009 backedges. 0 proven. 1552 refuted. 0 times theorem prover too weak. 1457 trivial. 0 not checked. [2018-10-27 09:06:15,351 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:06:15,351 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35, 35] total 69 [2018-10-27 09:06:15,351 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:06:15,352 INFO L460 AbstractCegarLoop]: Interpolant automaton has 36 states [2018-10-27 09:06:15,352 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2018-10-27 09:06:15,353 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2346, Invalid=2346, Unknown=0, NotChecked=0, Total=4692 [2018-10-27 09:06:15,353 INFO L87 Difference]: Start difference. First operand 205 states and 206 transitions. Second operand 36 states. [2018-10-27 09:06:15,769 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:06:15,769 INFO L93 Difference]: Finished difference Result 319 states and 323 transitions. [2018-10-27 09:06:15,770 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2018-10-27 09:06:15,770 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 204 [2018-10-27 09:06:15,770 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:06:15,772 INFO L225 Difference]: With dead ends: 319 [2018-10-27 09:06:15,772 INFO L226 Difference]: Without dead ends: 218 [2018-10-27 09:06:15,773 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 442 GetRequests, 375 SyntacticMatches, 0 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 128 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=2346, Invalid=2346, Unknown=0, NotChecked=0, Total=4692 [2018-10-27 09:06:15,773 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 218 states. [2018-10-27 09:06:15,777 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 218 to 208. [2018-10-27 09:06:15,777 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 208 states. [2018-10-27 09:06:15,778 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 208 states to 208 states and 209 transitions. [2018-10-27 09:06:15,778 INFO L78 Accepts]: Start accepts. Automaton has 208 states and 209 transitions. Word has length 204 [2018-10-27 09:06:15,778 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:06:15,778 INFO L481 AbstractCegarLoop]: Abstraction has 208 states and 209 transitions. [2018-10-27 09:06:15,778 INFO L482 AbstractCegarLoop]: Interpolant automaton has 36 states. [2018-10-27 09:06:15,779 INFO L276 IsEmpty]: Start isEmpty. Operand 208 states and 209 transitions. [2018-10-27 09:06:15,780 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 208 [2018-10-27 09:06:15,780 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:06:15,780 INFO L375 BasicCegarLoop]: trace histogram [34, 33, 33, 32, 31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:06:15,780 INFO L424 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:06:15,780 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:06:15,780 INFO L82 PathProgramCache]: Analyzing trace with hash -341455177, now seen corresponding path program 32 times [2018-10-27 09:06:15,781 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:06:15,781 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:06:15,781 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:06:15,782 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:06:15,782 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:06:15,815 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:06:16,419 INFO L134 CoverageAnalysis]: Checked inductivity of 3107 backedges. 0 proven. 1650 refuted. 0 times theorem prover too weak. 1457 trivial. 0 not checked. [2018-10-27 09:06:16,419 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:06:16,419 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:06:16,419 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:06:16,419 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:06:16,419 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:06:16,420 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:06:16,427 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 09:06:16,427 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 09:06:19,773 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 32 check-sat command(s) [2018-10-27 09:06:19,774 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:06:19,782 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:06:19,958 INFO L134 CoverageAnalysis]: Checked inductivity of 3107 backedges. 0 proven. 1457 refuted. 0 times theorem prover too weak. 1650 trivial. 0 not checked. [2018-10-27 09:06:19,959 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:06:21,307 INFO L134 CoverageAnalysis]: Checked inductivity of 3107 backedges. 0 proven. 1457 refuted. 0 times theorem prover too weak. 1650 trivial. 0 not checked. [2018-10-27 09:06:21,332 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:06:21,332 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 36, 36] total 73 [2018-10-27 09:06:21,332 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:06:21,332 INFO L460 AbstractCegarLoop]: Interpolant automaton has 39 states [2018-10-27 09:06:21,333 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2018-10-27 09:06:21,333 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2356, Invalid=2900, Unknown=0, NotChecked=0, Total=5256 [2018-10-27 09:06:21,333 INFO L87 Difference]: Start difference. First operand 208 states and 209 transitions. Second operand 39 states. [2018-10-27 09:06:22,217 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:06:22,218 INFO L93 Difference]: Finished difference Result 328 states and 333 transitions. [2018-10-27 09:06:22,218 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2018-10-27 09:06:22,218 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 207 [2018-10-27 09:06:22,219 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:06:22,220 INFO L225 Difference]: With dead ends: 328 [2018-10-27 09:06:22,220 INFO L226 Difference]: Without dead ends: 222 [2018-10-27 09:06:22,221 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 450 GetRequests, 378 SyntacticMatches, 0 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 365 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=2362, Invalid=3040, Unknown=0, NotChecked=0, Total=5402 [2018-10-27 09:06:22,222 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 222 states. [2018-10-27 09:06:22,226 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 222 to 220. [2018-10-27 09:06:22,226 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 220 states. [2018-10-27 09:06:22,227 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 220 states to 220 states and 221 transitions. [2018-10-27 09:06:22,227 INFO L78 Accepts]: Start accepts. Automaton has 220 states and 221 transitions. Word has length 207 [2018-10-27 09:06:22,228 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:06:22,228 INFO L481 AbstractCegarLoop]: Abstraction has 220 states and 221 transitions. [2018-10-27 09:06:22,228 INFO L482 AbstractCegarLoop]: Interpolant automaton has 39 states. [2018-10-27 09:06:22,228 INFO L276 IsEmpty]: Start isEmpty. Operand 220 states and 221 transitions. [2018-10-27 09:06:22,229 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 220 [2018-10-27 09:06:22,229 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:06:22,229 INFO L375 BasicCegarLoop]: trace histogram [35, 35, 34, 34, 34, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:06:22,229 INFO L424 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:06:22,230 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:06:22,230 INFO L82 PathProgramCache]: Analyzing trace with hash -1617730476, now seen corresponding path program 33 times [2018-10-27 09:06:22,230 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:06:22,231 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:06:22,231 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:06:22,231 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:06:22,231 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:06:22,265 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:06:22,911 INFO L134 CoverageAnalysis]: Checked inductivity of 3502 backedges. 0 proven. 1751 refuted. 0 times theorem prover too weak. 1751 trivial. 0 not checked. [2018-10-27 09:06:22,911 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:06:22,912 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:06:22,912 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:06:22,912 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:06:22,912 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:06:22,912 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:06:22,919 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 09:06:22,919 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 09:06:23,079 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 09:06:23,079 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:06:23,085 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:06:23,132 INFO L134 CoverageAnalysis]: Checked inductivity of 3502 backedges. 0 proven. 1751 refuted. 0 times theorem prover too weak. 1751 trivial. 0 not checked. [2018-10-27 09:06:23,133 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:06:24,719 INFO L134 CoverageAnalysis]: Checked inductivity of 3502 backedges. 0 proven. 1751 refuted. 0 times theorem prover too weak. 1751 trivial. 0 not checked. [2018-10-27 09:06:24,740 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:06:24,741 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 37, 37] total 73 [2018-10-27 09:06:24,741 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:06:24,741 INFO L460 AbstractCegarLoop]: Interpolant automaton has 38 states [2018-10-27 09:06:24,742 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2018-10-27 09:06:24,742 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2628, Invalid=2628, Unknown=0, NotChecked=0, Total=5256 [2018-10-27 09:06:24,742 INFO L87 Difference]: Start difference. First operand 220 states and 221 transitions. Second operand 38 states. [2018-10-27 09:06:25,101 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:06:25,102 INFO L93 Difference]: Finished difference Result 339 states and 342 transitions. [2018-10-27 09:06:25,102 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2018-10-27 09:06:25,102 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 219 [2018-10-27 09:06:25,103 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:06:25,104 INFO L225 Difference]: With dead ends: 339 [2018-10-27 09:06:25,104 INFO L226 Difference]: Without dead ends: 229 [2018-10-27 09:06:25,105 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 474 GetRequests, 403 SyntacticMatches, 0 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 136 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=2628, Invalid=2628, Unknown=0, NotChecked=0, Total=5256 [2018-10-27 09:06:25,105 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 229 states. [2018-10-27 09:06:25,109 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 229 to 223. [2018-10-27 09:06:25,109 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 223 states. [2018-10-27 09:06:25,110 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 223 states to 223 states and 224 transitions. [2018-10-27 09:06:25,110 INFO L78 Accepts]: Start accepts. Automaton has 223 states and 224 transitions. Word has length 219 [2018-10-27 09:06:25,110 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:06:25,110 INFO L481 AbstractCegarLoop]: Abstraction has 223 states and 224 transitions. [2018-10-27 09:06:25,110 INFO L482 AbstractCegarLoop]: Interpolant automaton has 38 states. [2018-10-27 09:06:25,111 INFO L276 IsEmpty]: Start isEmpty. Operand 223 states and 224 transitions. [2018-10-27 09:06:25,112 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 223 [2018-10-27 09:06:25,112 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:06:25,112 INFO L375 BasicCegarLoop]: trace histogram [36, 35, 35, 35, 34, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:06:25,112 INFO L424 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:06:25,112 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:06:25,112 INFO L82 PathProgramCache]: Analyzing trace with hash 1207553711, now seen corresponding path program 34 times [2018-10-27 09:06:25,113 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:06:25,113 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:06:25,113 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:06:25,114 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:06:25,114 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:06:25,147 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:06:25,984 INFO L134 CoverageAnalysis]: Checked inductivity of 3606 backedges. 0 proven. 1855 refuted. 0 times theorem prover too weak. 1751 trivial. 0 not checked. [2018-10-27 09:06:25,984 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:06:25,984 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:06:25,984 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:06:25,985 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:06:25,985 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:06:25,985 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:06:25,992 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:06:25,992 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:06:26,146 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:06:26,152 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:06:26,209 INFO L134 CoverageAnalysis]: Checked inductivity of 3606 backedges. 0 proven. 1855 refuted. 0 times theorem prover too weak. 1751 trivial. 0 not checked. [2018-10-27 09:06:26,209 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:06:27,693 INFO L134 CoverageAnalysis]: Checked inductivity of 3606 backedges. 0 proven. 1855 refuted. 0 times theorem prover too weak. 1751 trivial. 0 not checked. [2018-10-27 09:06:27,714 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:06:27,714 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 38, 38] total 75 [2018-10-27 09:06:27,714 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:06:27,714 INFO L460 AbstractCegarLoop]: Interpolant automaton has 39 states [2018-10-27 09:06:27,715 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2018-10-27 09:06:27,715 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2775, Invalid=2775, Unknown=0, NotChecked=0, Total=5550 [2018-10-27 09:06:27,716 INFO L87 Difference]: Start difference. First operand 223 states and 224 transitions. Second operand 39 states. [2018-10-27 09:06:28,080 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:06:28,080 INFO L93 Difference]: Finished difference Result 346 states and 350 transitions. [2018-10-27 09:06:28,081 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2018-10-27 09:06:28,081 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 222 [2018-10-27 09:06:28,081 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:06:28,083 INFO L225 Difference]: With dead ends: 346 [2018-10-27 09:06:28,083 INFO L226 Difference]: Without dead ends: 236 [2018-10-27 09:06:28,085 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 481 GetRequests, 408 SyntacticMatches, 0 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=2775, Invalid=2775, Unknown=0, NotChecked=0, Total=5550 [2018-10-27 09:06:28,085 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 236 states. [2018-10-27 09:06:28,089 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 236 to 226. [2018-10-27 09:06:28,089 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 226 states. [2018-10-27 09:06:28,090 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 226 states to 226 states and 227 transitions. [2018-10-27 09:06:28,090 INFO L78 Accepts]: Start accepts. Automaton has 226 states and 227 transitions. Word has length 222 [2018-10-27 09:06:28,090 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:06:28,090 INFO L481 AbstractCegarLoop]: Abstraction has 226 states and 227 transitions. [2018-10-27 09:06:28,090 INFO L482 AbstractCegarLoop]: Interpolant automaton has 39 states. [2018-10-27 09:06:28,090 INFO L276 IsEmpty]: Start isEmpty. Operand 226 states and 227 transitions. [2018-10-27 09:06:28,091 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 226 [2018-10-27 09:06:28,092 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:06:28,092 INFO L375 BasicCegarLoop]: trace histogram [37, 36, 36, 35, 34, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:06:28,092 INFO L424 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:06:28,092 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:06:28,092 INFO L82 PathProgramCache]: Analyzing trace with hash 774668916, now seen corresponding path program 35 times [2018-10-27 09:06:28,092 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:06:28,093 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:06:28,093 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:06:28,093 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:06:28,093 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:06:28,129 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:06:29,260 INFO L134 CoverageAnalysis]: Checked inductivity of 3713 backedges. 0 proven. 1962 refuted. 0 times theorem prover too weak. 1751 trivial. 0 not checked. [2018-10-27 09:06:29,260 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:06:29,261 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:06:29,261 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:06:29,261 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:06:29,261 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:06:29,261 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:06:29,268 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 09:06:29,268 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 09:06:33,801 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 35 check-sat command(s) [2018-10-27 09:06:33,801 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:06:33,810 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:06:34,017 INFO L134 CoverageAnalysis]: Checked inductivity of 3713 backedges. 0 proven. 1751 refuted. 0 times theorem prover too weak. 1962 trivial. 0 not checked. [2018-10-27 09:06:34,017 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:06:35,728 INFO L134 CoverageAnalysis]: Checked inductivity of 3713 backedges. 0 proven. 1751 refuted. 0 times theorem prover too weak. 1962 trivial. 0 not checked. [2018-10-27 09:06:35,751 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:06:35,752 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 39, 39] total 79 [2018-10-27 09:06:35,752 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:06:35,752 INFO L460 AbstractCegarLoop]: Interpolant automaton has 42 states [2018-10-27 09:06:35,752 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2018-10-27 09:06:35,753 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2785, Invalid=3377, Unknown=0, NotChecked=0, Total=6162 [2018-10-27 09:06:35,753 INFO L87 Difference]: Start difference. First operand 226 states and 227 transitions. Second operand 42 states. [2018-10-27 09:06:36,128 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:06:36,129 INFO L93 Difference]: Finished difference Result 355 states and 360 transitions. [2018-10-27 09:06:36,129 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2018-10-27 09:06:36,129 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 225 [2018-10-27 09:06:36,130 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:06:36,131 INFO L225 Difference]: With dead ends: 355 [2018-10-27 09:06:36,131 INFO L226 Difference]: Without dead ends: 240 [2018-10-27 09:06:36,132 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 489 GetRequests, 411 SyntacticMatches, 0 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 398 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=2791, Invalid=3529, Unknown=0, NotChecked=0, Total=6320 [2018-10-27 09:06:36,132 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 240 states. [2018-10-27 09:06:36,142 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 240 to 238. [2018-10-27 09:06:36,142 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 238 states. [2018-10-27 09:06:36,143 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 238 states to 238 states and 239 transitions. [2018-10-27 09:06:36,143 INFO L78 Accepts]: Start accepts. Automaton has 238 states and 239 transitions. Word has length 225 [2018-10-27 09:06:36,143 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:06:36,144 INFO L481 AbstractCegarLoop]: Abstraction has 238 states and 239 transitions. [2018-10-27 09:06:36,144 INFO L482 AbstractCegarLoop]: Interpolant automaton has 42 states. [2018-10-27 09:06:36,144 INFO L276 IsEmpty]: Start isEmpty. Operand 238 states and 239 transitions. [2018-10-27 09:06:36,145 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 238 [2018-10-27 09:06:36,145 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:06:36,145 INFO L375 BasicCegarLoop]: trace histogram [38, 38, 37, 37, 37, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:06:36,145 INFO L424 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:06:36,146 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:06:36,146 INFO L82 PathProgramCache]: Analyzing trace with hash -74539529, now seen corresponding path program 36 times [2018-10-27 09:06:36,146 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:06:36,146 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:06:36,147 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:06:36,147 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:06:36,147 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:06:36,183 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:06:36,865 INFO L134 CoverageAnalysis]: Checked inductivity of 4144 backedges. 0 proven. 2072 refuted. 0 times theorem prover too weak. 2072 trivial. 0 not checked. [2018-10-27 09:06:36,866 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:06:36,866 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:06:36,866 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:06:36,866 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:06:36,866 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:06:36,866 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:06:36,874 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 09:06:36,874 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 09:06:37,045 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 09:06:37,045 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:06:37,050 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:06:37,106 INFO L134 CoverageAnalysis]: Checked inductivity of 4144 backedges. 0 proven. 2072 refuted. 0 times theorem prover too weak. 2072 trivial. 0 not checked. [2018-10-27 09:06:37,107 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:06:39,786 INFO L134 CoverageAnalysis]: Checked inductivity of 4144 backedges. 0 proven. 2072 refuted. 0 times theorem prover too weak. 2072 trivial. 0 not checked. [2018-10-27 09:06:39,808 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:06:39,808 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 40, 40] total 79 [2018-10-27 09:06:39,809 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:06:39,809 INFO L460 AbstractCegarLoop]: Interpolant automaton has 41 states [2018-10-27 09:06:39,809 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2018-10-27 09:06:39,810 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3081, Invalid=3081, Unknown=0, NotChecked=0, Total=6162 [2018-10-27 09:06:39,810 INFO L87 Difference]: Start difference. First operand 238 states and 239 transitions. Second operand 41 states. [2018-10-27 09:06:40,194 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:06:40,194 INFO L93 Difference]: Finished difference Result 366 states and 369 transitions. [2018-10-27 09:06:40,195 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2018-10-27 09:06:40,195 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 237 [2018-10-27 09:06:40,195 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:06:40,197 INFO L225 Difference]: With dead ends: 366 [2018-10-27 09:06:40,197 INFO L226 Difference]: Without dead ends: 247 [2018-10-27 09:06:40,198 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 513 GetRequests, 436 SyntacticMatches, 0 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 148 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=3081, Invalid=3081, Unknown=0, NotChecked=0, Total=6162 [2018-10-27 09:06:40,198 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 247 states. [2018-10-27 09:06:40,202 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 247 to 241. [2018-10-27 09:06:40,202 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 241 states. [2018-10-27 09:06:40,203 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 241 states to 241 states and 242 transitions. [2018-10-27 09:06:40,203 INFO L78 Accepts]: Start accepts. Automaton has 241 states and 242 transitions. Word has length 237 [2018-10-27 09:06:40,204 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:06:40,204 INFO L481 AbstractCegarLoop]: Abstraction has 241 states and 242 transitions. [2018-10-27 09:06:40,204 INFO L482 AbstractCegarLoop]: Interpolant automaton has 41 states. [2018-10-27 09:06:40,204 INFO L276 IsEmpty]: Start isEmpty. Operand 241 states and 242 transitions. [2018-10-27 09:06:40,205 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 241 [2018-10-27 09:06:40,205 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:06:40,206 INFO L375 BasicCegarLoop]: trace histogram [39, 38, 38, 38, 37, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:06:40,206 INFO L424 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:06:40,206 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:06:40,206 INFO L82 PathProgramCache]: Analyzing trace with hash 1048528786, now seen corresponding path program 37 times [2018-10-27 09:06:40,206 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:06:40,207 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:06:40,207 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:06:40,207 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:06:40,207 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:06:40,247 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:06:41,075 INFO L134 CoverageAnalysis]: Checked inductivity of 4257 backedges. 0 proven. 2185 refuted. 0 times theorem prover too weak. 2072 trivial. 0 not checked. [2018-10-27 09:06:41,075 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:06:41,075 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:06:41,075 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:06:41,075 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:06:41,075 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:06:41,075 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:06:41,083 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:06:41,083 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:06:41,250 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:06:41,255 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:06:41,349 INFO L134 CoverageAnalysis]: Checked inductivity of 4257 backedges. 0 proven. 2185 refuted. 0 times theorem prover too weak. 2072 trivial. 0 not checked. [2018-10-27 09:06:41,349 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:06:43,005 INFO L134 CoverageAnalysis]: Checked inductivity of 4257 backedges. 0 proven. 2185 refuted. 0 times theorem prover too weak. 2072 trivial. 0 not checked. [2018-10-27 09:06:43,026 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:06:43,027 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 41, 41] total 81 [2018-10-27 09:06:43,027 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:06:43,027 INFO L460 AbstractCegarLoop]: Interpolant automaton has 42 states [2018-10-27 09:06:43,028 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2018-10-27 09:06:43,028 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3240, Invalid=3240, Unknown=0, NotChecked=0, Total=6480 [2018-10-27 09:06:43,029 INFO L87 Difference]: Start difference. First operand 241 states and 242 transitions. Second operand 42 states. [2018-10-27 09:06:43,410 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:06:43,411 INFO L93 Difference]: Finished difference Result 373 states and 377 transitions. [2018-10-27 09:06:43,411 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2018-10-27 09:06:43,411 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 240 [2018-10-27 09:06:43,412 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:06:43,413 INFO L225 Difference]: With dead ends: 373 [2018-10-27 09:06:43,414 INFO L226 Difference]: Without dead ends: 254 [2018-10-27 09:06:43,415 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 520 GetRequests, 441 SyntacticMatches, 0 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 152 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=3240, Invalid=3240, Unknown=0, NotChecked=0, Total=6480 [2018-10-27 09:06:43,416 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 254 states. [2018-10-27 09:06:43,419 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 254 to 244. [2018-10-27 09:06:43,420 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 244 states. [2018-10-27 09:06:43,420 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 244 states to 244 states and 245 transitions. [2018-10-27 09:06:43,421 INFO L78 Accepts]: Start accepts. Automaton has 244 states and 245 transitions. Word has length 240 [2018-10-27 09:06:43,421 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:06:43,421 INFO L481 AbstractCegarLoop]: Abstraction has 244 states and 245 transitions. [2018-10-27 09:06:43,421 INFO L482 AbstractCegarLoop]: Interpolant automaton has 42 states. [2018-10-27 09:06:43,421 INFO L276 IsEmpty]: Start isEmpty. Operand 244 states and 245 transitions. [2018-10-27 09:06:43,422 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 244 [2018-10-27 09:06:43,423 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:06:43,423 INFO L375 BasicCegarLoop]: trace histogram [40, 39, 39, 38, 37, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:06:43,423 INFO L424 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:06:43,423 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:06:43,423 INFO L82 PathProgramCache]: Analyzing trace with hash 581465111, now seen corresponding path program 38 times [2018-10-27 09:06:43,424 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:06:43,424 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:06:43,424 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:06:43,425 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:06:43,425 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:06:43,467 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:06:44,735 INFO L134 CoverageAnalysis]: Checked inductivity of 4373 backedges. 0 proven. 2301 refuted. 0 times theorem prover too weak. 2072 trivial. 0 not checked. [2018-10-27 09:06:44,735 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:06:44,735 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:06:44,735 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:06:44,735 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:06:44,735 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:06:44,735 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 41 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 41 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:06:44,744 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 09:06:44,744 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 09:06:51,232 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 38 check-sat command(s) [2018-10-27 09:06:51,232 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:06:51,242 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:06:51,337 INFO L134 CoverageAnalysis]: Checked inductivity of 4373 backedges. 0 proven. 2072 refuted. 0 times theorem prover too weak. 2301 trivial. 0 not checked. [2018-10-27 09:06:51,337 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:06:53,073 INFO L134 CoverageAnalysis]: Checked inductivity of 4373 backedges. 0 proven. 2072 refuted. 0 times theorem prover too weak. 2301 trivial. 0 not checked. [2018-10-27 09:06:53,099 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:06:53,099 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 42, 42] total 85 [2018-10-27 09:06:53,100 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:06:53,100 INFO L460 AbstractCegarLoop]: Interpolant automaton has 45 states [2018-10-27 09:06:53,101 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2018-10-27 09:06:53,101 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3250, Invalid=3890, Unknown=0, NotChecked=0, Total=7140 [2018-10-27 09:06:53,101 INFO L87 Difference]: Start difference. First operand 244 states and 245 transitions. Second operand 45 states. [2018-10-27 09:06:53,613 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:06:53,614 INFO L93 Difference]: Finished difference Result 382 states and 387 transitions. [2018-10-27 09:06:53,614 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2018-10-27 09:06:53,614 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 243 [2018-10-27 09:06:53,614 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:06:53,616 INFO L225 Difference]: With dead ends: 382 [2018-10-27 09:06:53,616 INFO L226 Difference]: Without dead ends: 258 [2018-10-27 09:06:53,617 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 528 GetRequests, 444 SyntacticMatches, 0 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 431 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=3256, Invalid=4054, Unknown=0, NotChecked=0, Total=7310 [2018-10-27 09:06:53,618 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 258 states. [2018-10-27 09:06:53,622 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 258 to 256. [2018-10-27 09:06:53,622 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 256 states. [2018-10-27 09:06:53,623 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 256 states to 256 states and 257 transitions. [2018-10-27 09:06:53,623 INFO L78 Accepts]: Start accepts. Automaton has 256 states and 257 transitions. Word has length 243 [2018-10-27 09:06:53,623 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:06:53,624 INFO L481 AbstractCegarLoop]: Abstraction has 256 states and 257 transitions. [2018-10-27 09:06:53,624 INFO L482 AbstractCegarLoop]: Interpolant automaton has 45 states. [2018-10-27 09:06:53,624 INFO L276 IsEmpty]: Start isEmpty. Operand 256 states and 257 transitions. [2018-10-27 09:06:53,625 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 256 [2018-10-27 09:06:53,625 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:06:53,625 INFO L375 BasicCegarLoop]: trace histogram [41, 41, 40, 40, 40, 40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:06:53,626 INFO L424 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:06:53,626 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:06:53,626 INFO L82 PathProgramCache]: Analyzing trace with hash -1711526796, now seen corresponding path program 39 times [2018-10-27 09:06:53,626 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:06:53,627 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:06:53,627 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:06:53,627 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:06:53,627 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:06:53,668 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:06:54,659 INFO L134 CoverageAnalysis]: Checked inductivity of 4840 backedges. 0 proven. 2420 refuted. 0 times theorem prover too weak. 2420 trivial. 0 not checked. [2018-10-27 09:06:54,659 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:06:54,659 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:06:54,660 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:06:54,660 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:06:54,660 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:06:54,660 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:06:54,668 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 09:06:54,668 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 09:06:54,855 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 09:06:54,856 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:06:54,863 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:06:54,948 INFO L134 CoverageAnalysis]: Checked inductivity of 4840 backedges. 0 proven. 2420 refuted. 0 times theorem prover too weak. 2420 trivial. 0 not checked. [2018-10-27 09:06:54,948 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:06:56,784 INFO L134 CoverageAnalysis]: Checked inductivity of 4840 backedges. 0 proven. 2420 refuted. 0 times theorem prover too weak. 2420 trivial. 0 not checked. [2018-10-27 09:06:56,806 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:06:56,806 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 43, 43] total 85 [2018-10-27 09:06:56,806 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:06:56,806 INFO L460 AbstractCegarLoop]: Interpolant automaton has 44 states [2018-10-27 09:06:56,807 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2018-10-27 09:06:56,807 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3570, Invalid=3570, Unknown=0, NotChecked=0, Total=7140 [2018-10-27 09:06:56,808 INFO L87 Difference]: Start difference. First operand 256 states and 257 transitions. Second operand 44 states. [2018-10-27 09:06:57,262 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:06:57,262 INFO L93 Difference]: Finished difference Result 393 states and 396 transitions. [2018-10-27 09:06:57,262 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2018-10-27 09:06:57,263 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 255 [2018-10-27 09:06:57,263 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:06:57,264 INFO L225 Difference]: With dead ends: 393 [2018-10-27 09:06:57,265 INFO L226 Difference]: Without dead ends: 265 [2018-10-27 09:06:57,266 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 552 GetRequests, 469 SyntacticMatches, 0 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 160 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=3570, Invalid=3570, Unknown=0, NotChecked=0, Total=7140 [2018-10-27 09:06:57,266 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 265 states. [2018-10-27 09:06:57,270 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 265 to 259. [2018-10-27 09:06:57,270 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 259 states. [2018-10-27 09:06:57,271 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 259 states to 259 states and 260 transitions. [2018-10-27 09:06:57,271 INFO L78 Accepts]: Start accepts. Automaton has 259 states and 260 transitions. Word has length 255 [2018-10-27 09:06:57,272 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:06:57,272 INFO L481 AbstractCegarLoop]: Abstraction has 259 states and 260 transitions. [2018-10-27 09:06:57,272 INFO L482 AbstractCegarLoop]: Interpolant automaton has 44 states. [2018-10-27 09:06:57,272 INFO L276 IsEmpty]: Start isEmpty. Operand 259 states and 260 transitions. [2018-10-27 09:06:57,273 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 259 [2018-10-27 09:06:57,273 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:06:57,274 INFO L375 BasicCegarLoop]: trace histogram [42, 41, 41, 41, 40, 40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:06:57,274 INFO L424 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:06:57,274 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:06:57,274 INFO L82 PathProgramCache]: Analyzing trace with hash 27116879, now seen corresponding path program 40 times [2018-10-27 09:06:57,274 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:06:57,275 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:06:57,275 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:06:57,275 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:06:57,275 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:06:57,315 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:06:58,199 INFO L134 CoverageAnalysis]: Checked inductivity of 4962 backedges. 0 proven. 2542 refuted. 0 times theorem prover too weak. 2420 trivial. 0 not checked. [2018-10-27 09:06:58,200 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:06:58,200 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:06:58,200 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:06:58,200 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:06:58,200 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:06:58,200 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 43 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 43 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:06:58,208 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:06:58,208 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:06:58,391 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:06:58,397 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:06:58,555 INFO L134 CoverageAnalysis]: Checked inductivity of 4962 backedges. 0 proven. 2542 refuted. 0 times theorem prover too weak. 2420 trivial. 0 not checked. [2018-10-27 09:06:58,555 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:07:00,854 INFO L134 CoverageAnalysis]: Checked inductivity of 4962 backedges. 0 proven. 2542 refuted. 0 times theorem prover too weak. 2420 trivial. 0 not checked. [2018-10-27 09:07:00,876 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:07:00,877 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 44, 44] total 87 [2018-10-27 09:07:00,877 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:07:00,877 INFO L460 AbstractCegarLoop]: Interpolant automaton has 45 states [2018-10-27 09:07:00,878 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2018-10-27 09:07:00,878 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3741, Invalid=3741, Unknown=0, NotChecked=0, Total=7482 [2018-10-27 09:07:00,878 INFO L87 Difference]: Start difference. First operand 259 states and 260 transitions. Second operand 45 states. [2018-10-27 09:07:01,328 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:07:01,328 INFO L93 Difference]: Finished difference Result 400 states and 404 transitions. [2018-10-27 09:07:01,329 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2018-10-27 09:07:01,329 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 258 [2018-10-27 09:07:01,329 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:07:01,330 INFO L225 Difference]: With dead ends: 400 [2018-10-27 09:07:01,330 INFO L226 Difference]: Without dead ends: 272 [2018-10-27 09:07:01,331 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 559 GetRequests, 474 SyntacticMatches, 0 SemanticMatches, 85 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 164 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=3741, Invalid=3741, Unknown=0, NotChecked=0, Total=7482 [2018-10-27 09:07:01,331 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 272 states. [2018-10-27 09:07:01,334 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 272 to 262. [2018-10-27 09:07:01,335 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 262 states. [2018-10-27 09:07:01,335 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 262 states to 262 states and 263 transitions. [2018-10-27 09:07:01,335 INFO L78 Accepts]: Start accepts. Automaton has 262 states and 263 transitions. Word has length 258 [2018-10-27 09:07:01,336 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:07:01,336 INFO L481 AbstractCegarLoop]: Abstraction has 262 states and 263 transitions. [2018-10-27 09:07:01,336 INFO L482 AbstractCegarLoop]: Interpolant automaton has 45 states. [2018-10-27 09:07:01,336 INFO L276 IsEmpty]: Start isEmpty. Operand 262 states and 263 transitions. [2018-10-27 09:07:01,337 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 262 [2018-10-27 09:07:01,337 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:07:01,337 INFO L375 BasicCegarLoop]: trace histogram [43, 42, 42, 41, 40, 40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:07:01,338 INFO L424 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:07:01,338 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:07:01,338 INFO L82 PathProgramCache]: Analyzing trace with hash -1344750956, now seen corresponding path program 41 times [2018-10-27 09:07:01,338 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:07:01,339 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:07:01,339 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:07:01,339 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:07:01,339 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:07:01,381 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:07:03,360 INFO L134 CoverageAnalysis]: Checked inductivity of 5087 backedges. 0 proven. 2667 refuted. 0 times theorem prover too weak. 2420 trivial. 0 not checked. [2018-10-27 09:07:03,360 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:07:03,360 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:07:03,360 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:07:03,360 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:07:03,361 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:07:03,361 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:07:03,369 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 09:07:03,370 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 09:07:12,217 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 41 check-sat command(s) [2018-10-27 09:07:12,218 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:07:12,227 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:07:12,331 INFO L134 CoverageAnalysis]: Checked inductivity of 5087 backedges. 0 proven. 2420 refuted. 0 times theorem prover too weak. 2667 trivial. 0 not checked. [2018-10-27 09:07:12,331 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:07:14,401 INFO L134 CoverageAnalysis]: Checked inductivity of 5087 backedges. 0 proven. 2420 refuted. 0 times theorem prover too weak. 2667 trivial. 0 not checked. [2018-10-27 09:07:14,426 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:07:14,427 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 45, 45] total 91 [2018-10-27 09:07:14,427 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:07:14,427 INFO L460 AbstractCegarLoop]: Interpolant automaton has 48 states [2018-10-27 09:07:14,428 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2018-10-27 09:07:14,428 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3751, Invalid=4439, Unknown=0, NotChecked=0, Total=8190 [2018-10-27 09:07:14,428 INFO L87 Difference]: Start difference. First operand 262 states and 263 transitions. Second operand 48 states. [2018-10-27 09:07:15,041 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:07:15,041 INFO L93 Difference]: Finished difference Result 409 states and 414 transitions. [2018-10-27 09:07:15,041 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2018-10-27 09:07:15,041 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 261 [2018-10-27 09:07:15,042 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:07:15,043 INFO L225 Difference]: With dead ends: 409 [2018-10-27 09:07:15,043 INFO L226 Difference]: Without dead ends: 276 [2018-10-27 09:07:15,044 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 567 GetRequests, 477 SyntacticMatches, 0 SemanticMatches, 90 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 464 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=3757, Invalid=4615, Unknown=0, NotChecked=0, Total=8372 [2018-10-27 09:07:15,044 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 276 states. [2018-10-27 09:07:15,048 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 276 to 274. [2018-10-27 09:07:15,048 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 274 states. [2018-10-27 09:07:15,049 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 274 states to 274 states and 275 transitions. [2018-10-27 09:07:15,049 INFO L78 Accepts]: Start accepts. Automaton has 274 states and 275 transitions. Word has length 261 [2018-10-27 09:07:15,049 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:07:15,049 INFO L481 AbstractCegarLoop]: Abstraction has 274 states and 275 transitions. [2018-10-27 09:07:15,049 INFO L482 AbstractCegarLoop]: Interpolant automaton has 48 states. [2018-10-27 09:07:15,050 INFO L276 IsEmpty]: Start isEmpty. Operand 274 states and 275 transitions. [2018-10-27 09:07:15,051 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 274 [2018-10-27 09:07:15,051 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:07:15,051 INFO L375 BasicCegarLoop]: trace histogram [44, 44, 43, 43, 43, 43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:07:15,051 INFO L424 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:07:15,052 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:07:15,052 INFO L82 PathProgramCache]: Analyzing trace with hash -1216246953, now seen corresponding path program 42 times [2018-10-27 09:07:15,052 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:07:15,052 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:07:15,053 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:07:15,053 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:07:15,053 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:07:15,097 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:07:16,708 INFO L134 CoverageAnalysis]: Checked inductivity of 5590 backedges. 0 proven. 2795 refuted. 0 times theorem prover too weak. 2795 trivial. 0 not checked. [2018-10-27 09:07:16,708 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:07:16,708 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:07:16,708 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:07:16,708 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:07:16,708 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:07:16,708 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 45 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 45 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:07:16,715 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 09:07:16,715 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 09:07:16,917 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 09:07:16,917 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:07:16,923 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:07:16,973 INFO L134 CoverageAnalysis]: Checked inductivity of 5590 backedges. 0 proven. 2795 refuted. 0 times theorem prover too weak. 2795 trivial. 0 not checked. [2018-10-27 09:07:16,973 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:07:19,053 INFO L134 CoverageAnalysis]: Checked inductivity of 5590 backedges. 0 proven. 2795 refuted. 0 times theorem prover too weak. 2795 trivial. 0 not checked. [2018-10-27 09:07:19,074 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:07:19,075 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 46, 46] total 91 [2018-10-27 09:07:19,075 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:07:19,075 INFO L460 AbstractCegarLoop]: Interpolant automaton has 47 states [2018-10-27 09:07:19,076 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2018-10-27 09:07:19,076 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4095, Invalid=4095, Unknown=0, NotChecked=0, Total=8190 [2018-10-27 09:07:19,077 INFO L87 Difference]: Start difference. First operand 274 states and 275 transitions. Second operand 47 states. [2018-10-27 09:07:19,651 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:07:19,651 INFO L93 Difference]: Finished difference Result 420 states and 423 transitions. [2018-10-27 09:07:19,651 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2018-10-27 09:07:19,651 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 273 [2018-10-27 09:07:19,652 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:07:19,653 INFO L225 Difference]: With dead ends: 420 [2018-10-27 09:07:19,654 INFO L226 Difference]: Without dead ends: 283 [2018-10-27 09:07:19,655 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 591 GetRequests, 502 SyntacticMatches, 0 SemanticMatches, 89 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 172 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=4095, Invalid=4095, Unknown=0, NotChecked=0, Total=8190 [2018-10-27 09:07:19,655 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 283 states. [2018-10-27 09:07:19,660 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 283 to 277. [2018-10-27 09:07:19,660 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 277 states. [2018-10-27 09:07:19,661 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 277 states to 277 states and 278 transitions. [2018-10-27 09:07:19,661 INFO L78 Accepts]: Start accepts. Automaton has 277 states and 278 transitions. Word has length 273 [2018-10-27 09:07:19,661 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:07:19,661 INFO L481 AbstractCegarLoop]: Abstraction has 277 states and 278 transitions. [2018-10-27 09:07:19,661 INFO L482 AbstractCegarLoop]: Interpolant automaton has 47 states. [2018-10-27 09:07:19,661 INFO L276 IsEmpty]: Start isEmpty. Operand 277 states and 278 transitions. [2018-10-27 09:07:19,663 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 277 [2018-10-27 09:07:19,663 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:07:19,663 INFO L375 BasicCegarLoop]: trace histogram [45, 44, 44, 44, 43, 43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:07:19,663 INFO L424 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:07:19,663 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:07:19,663 INFO L82 PathProgramCache]: Analyzing trace with hash -206650510, now seen corresponding path program 43 times [2018-10-27 09:07:19,664 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:07:19,664 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:07:19,664 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:07:19,664 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:07:19,664 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:07:19,703 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:07:20,991 INFO L134 CoverageAnalysis]: Checked inductivity of 5721 backedges. 0 proven. 2926 refuted. 0 times theorem prover too weak. 2795 trivial. 0 not checked. [2018-10-27 09:07:20,991 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:07:20,991 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:07:20,991 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:07:20,991 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:07:20,991 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:07:20,991 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:07:21,000 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:07:21,001 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:07:21,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:07:21,207 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:07:21,276 INFO L134 CoverageAnalysis]: Checked inductivity of 5721 backedges. 0 proven. 2926 refuted. 0 times theorem prover too weak. 2795 trivial. 0 not checked. [2018-10-27 09:07:21,276 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:07:23,428 INFO L134 CoverageAnalysis]: Checked inductivity of 5721 backedges. 0 proven. 2926 refuted. 0 times theorem prover too weak. 2795 trivial. 0 not checked. [2018-10-27 09:07:23,448 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:07:23,449 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 47, 47] total 93 [2018-10-27 09:07:23,449 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:07:23,449 INFO L460 AbstractCegarLoop]: Interpolant automaton has 48 states [2018-10-27 09:07:23,450 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2018-10-27 09:07:23,450 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4278, Invalid=4278, Unknown=0, NotChecked=0, Total=8556 [2018-10-27 09:07:23,450 INFO L87 Difference]: Start difference. First operand 277 states and 278 transitions. Second operand 48 states. [2018-10-27 09:07:24,030 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:07:24,030 INFO L93 Difference]: Finished difference Result 427 states and 431 transitions. [2018-10-27 09:07:24,030 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2018-10-27 09:07:24,030 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 276 [2018-10-27 09:07:24,031 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:07:24,032 INFO L225 Difference]: With dead ends: 427 [2018-10-27 09:07:24,032 INFO L226 Difference]: Without dead ends: 290 [2018-10-27 09:07:24,033 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 598 GetRequests, 507 SyntacticMatches, 0 SemanticMatches, 91 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 176 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=4278, Invalid=4278, Unknown=0, NotChecked=0, Total=8556 [2018-10-27 09:07:24,033 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 290 states. [2018-10-27 09:07:24,037 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 290 to 280. [2018-10-27 09:07:24,038 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 280 states. [2018-10-27 09:07:24,038 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 280 states to 280 states and 281 transitions. [2018-10-27 09:07:24,039 INFO L78 Accepts]: Start accepts. Automaton has 280 states and 281 transitions. Word has length 276 [2018-10-27 09:07:24,039 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:07:24,039 INFO L481 AbstractCegarLoop]: Abstraction has 280 states and 281 transitions. [2018-10-27 09:07:24,039 INFO L482 AbstractCegarLoop]: Interpolant automaton has 48 states. [2018-10-27 09:07:24,039 INFO L276 IsEmpty]: Start isEmpty. Operand 280 states and 281 transitions. [2018-10-27 09:07:24,041 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 280 [2018-10-27 09:07:24,041 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:07:24,041 INFO L375 BasicCegarLoop]: trace histogram [46, 45, 45, 44, 43, 43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:07:24,041 INFO L424 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:07:24,041 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:07:24,042 INFO L82 PathProgramCache]: Analyzing trace with hash -974990985, now seen corresponding path program 44 times [2018-10-27 09:07:24,042 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:07:24,042 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:07:24,042 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:07:24,043 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:07:24,043 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:07:24,089 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:07:25,358 INFO L134 CoverageAnalysis]: Checked inductivity of 5855 backedges. 0 proven. 3060 refuted. 0 times theorem prover too weak. 2795 trivial. 0 not checked. [2018-10-27 09:07:25,358 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:07:25,358 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:07:25,358 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:07:25,358 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:07:25,358 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:07:25,358 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 47 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 47 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:07:25,368 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 09:07:25,368 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 09:07:54,513 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 44 check-sat command(s) [2018-10-27 09:07:54,513 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:07:54,528 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:07:54,636 INFO L134 CoverageAnalysis]: Checked inductivity of 5855 backedges. 0 proven. 2795 refuted. 0 times theorem prover too weak. 3060 trivial. 0 not checked. [2018-10-27 09:07:54,636 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:07:57,299 INFO L134 CoverageAnalysis]: Checked inductivity of 5855 backedges. 0 proven. 2795 refuted. 0 times theorem prover too weak. 3060 trivial. 0 not checked. [2018-10-27 09:07:57,327 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:07:57,327 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 48, 48] total 97 [2018-10-27 09:07:57,327 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:07:57,327 INFO L460 AbstractCegarLoop]: Interpolant automaton has 51 states [2018-10-27 09:07:57,328 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2018-10-27 09:07:57,328 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4288, Invalid=5024, Unknown=0, NotChecked=0, Total=9312 [2018-10-27 09:07:57,328 INFO L87 Difference]: Start difference. First operand 280 states and 281 transitions. Second operand 51 states. [2018-10-27 09:07:57,896 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:07:57,896 INFO L93 Difference]: Finished difference Result 436 states and 441 transitions. [2018-10-27 09:07:57,896 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2018-10-27 09:07:57,896 INFO L78 Accepts]: Start accepts. Automaton has 51 states. Word has length 279 [2018-10-27 09:07:57,897 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:07:57,898 INFO L225 Difference]: With dead ends: 436 [2018-10-27 09:07:57,899 INFO L226 Difference]: Without dead ends: 294 [2018-10-27 09:07:57,900 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 606 GetRequests, 510 SyntacticMatches, 0 SemanticMatches, 96 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 497 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=4294, Invalid=5212, Unknown=0, NotChecked=0, Total=9506 [2018-10-27 09:07:57,901 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 294 states. [2018-10-27 09:07:57,904 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 294 to 292. [2018-10-27 09:07:57,904 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 292 states. [2018-10-27 09:07:57,905 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 292 states to 292 states and 293 transitions. [2018-10-27 09:07:57,905 INFO L78 Accepts]: Start accepts. Automaton has 292 states and 293 transitions. Word has length 279 [2018-10-27 09:07:57,905 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:07:57,905 INFO L481 AbstractCegarLoop]: Abstraction has 292 states and 293 transitions. [2018-10-27 09:07:57,905 INFO L482 AbstractCegarLoop]: Interpolant automaton has 51 states. [2018-10-27 09:07:57,905 INFO L276 IsEmpty]: Start isEmpty. Operand 292 states and 293 transitions. [2018-10-27 09:07:57,906 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 292 [2018-10-27 09:07:57,906 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:07:57,907 INFO L375 BasicCegarLoop]: trace histogram [47, 47, 46, 46, 46, 46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:07:57,907 INFO L424 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:07:57,907 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:07:57,907 INFO L82 PathProgramCache]: Analyzing trace with hash -622232428, now seen corresponding path program 45 times [2018-10-27 09:07:57,907 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:07:57,908 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:07:57,908 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:07:57,908 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:07:57,908 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:07:57,951 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:07:58,947 INFO L134 CoverageAnalysis]: Checked inductivity of 6394 backedges. 0 proven. 3197 refuted. 0 times theorem prover too weak. 3197 trivial. 0 not checked. [2018-10-27 09:07:58,947 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:07:58,947 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:07:58,948 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:07:58,948 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:07:58,948 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:07:58,948 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 48 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 48 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:07:58,957 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 09:07:58,958 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 09:07:59,174 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 09:07:59,175 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:07:59,182 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:07:59,260 INFO L134 CoverageAnalysis]: Checked inductivity of 6394 backedges. 0 proven. 3197 refuted. 0 times theorem prover too weak. 3197 trivial. 0 not checked. [2018-10-27 09:07:59,260 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:08:01,960 INFO L134 CoverageAnalysis]: Checked inductivity of 6394 backedges. 0 proven. 3197 refuted. 0 times theorem prover too weak. 3197 trivial. 0 not checked. [2018-10-27 09:08:01,982 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:08:01,982 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49, 49] total 97 [2018-10-27 09:08:01,982 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:08:01,982 INFO L460 AbstractCegarLoop]: Interpolant automaton has 50 states [2018-10-27 09:08:01,983 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2018-10-27 09:08:01,983 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4656, Invalid=4656, Unknown=0, NotChecked=0, Total=9312 [2018-10-27 09:08:01,983 INFO L87 Difference]: Start difference. First operand 292 states and 293 transitions. Second operand 50 states. [2018-10-27 09:08:02,685 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:08:02,685 INFO L93 Difference]: Finished difference Result 447 states and 450 transitions. [2018-10-27 09:08:02,686 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2018-10-27 09:08:02,686 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 291 [2018-10-27 09:08:02,686 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:08:02,687 INFO L225 Difference]: With dead ends: 447 [2018-10-27 09:08:02,687 INFO L226 Difference]: Without dead ends: 301 [2018-10-27 09:08:02,688 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 630 GetRequests, 535 SyntacticMatches, 0 SemanticMatches, 95 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 184 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=4656, Invalid=4656, Unknown=0, NotChecked=0, Total=9312 [2018-10-27 09:08:02,688 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 301 states. [2018-10-27 09:08:02,692 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 301 to 295. [2018-10-27 09:08:02,692 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 295 states. [2018-10-27 09:08:02,693 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 295 states to 295 states and 296 transitions. [2018-10-27 09:08:02,693 INFO L78 Accepts]: Start accepts. Automaton has 295 states and 296 transitions. Word has length 291 [2018-10-27 09:08:02,693 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:08:02,694 INFO L481 AbstractCegarLoop]: Abstraction has 295 states and 296 transitions. [2018-10-27 09:08:02,694 INFO L482 AbstractCegarLoop]: Interpolant automaton has 50 states. [2018-10-27 09:08:02,694 INFO L276 IsEmpty]: Start isEmpty. Operand 295 states and 296 transitions. [2018-10-27 09:08:02,695 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 295 [2018-10-27 09:08:02,695 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:08:02,696 INFO L375 BasicCegarLoop]: trace histogram [48, 47, 47, 47, 46, 46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:08:02,696 INFO L424 AbstractCegarLoop]: === Iteration 50 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:08:02,696 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:08:02,696 INFO L82 PathProgramCache]: Analyzing trace with hash 1009845231, now seen corresponding path program 46 times [2018-10-27 09:08:02,696 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:08:02,697 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:08:02,697 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:08:02,697 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:08:02,697 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:08:02,748 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:08:03,943 INFO L134 CoverageAnalysis]: Checked inductivity of 6534 backedges. 0 proven. 3337 refuted. 0 times theorem prover too weak. 3197 trivial. 0 not checked. [2018-10-27 09:08:03,944 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:08:03,944 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:08:03,944 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:08:03,944 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:08:03,944 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:08:03,944 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 49 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 49 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:08:03,952 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:08:03,952 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:08:04,169 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:08:04,176 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:08:04,235 INFO L134 CoverageAnalysis]: Checked inductivity of 6534 backedges. 0 proven. 3337 refuted. 0 times theorem prover too weak. 3197 trivial. 0 not checked. [2018-10-27 09:08:04,235 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:08:07,066 INFO L134 CoverageAnalysis]: Checked inductivity of 6534 backedges. 0 proven. 3337 refuted. 0 times theorem prover too weak. 3197 trivial. 0 not checked. [2018-10-27 09:08:07,088 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:08:07,088 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 50, 50] total 99 [2018-10-27 09:08:07,088 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:08:07,089 INFO L460 AbstractCegarLoop]: Interpolant automaton has 51 states [2018-10-27 09:08:07,089 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2018-10-27 09:08:07,089 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4851, Invalid=4851, Unknown=0, NotChecked=0, Total=9702 [2018-10-27 09:08:07,090 INFO L87 Difference]: Start difference. First operand 295 states and 296 transitions. Second operand 51 states. [2018-10-27 09:08:07,798 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:08:07,798 INFO L93 Difference]: Finished difference Result 454 states and 458 transitions. [2018-10-27 09:08:07,801 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2018-10-27 09:08:07,801 INFO L78 Accepts]: Start accepts. Automaton has 51 states. Word has length 294 [2018-10-27 09:08:07,802 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:08:07,803 INFO L225 Difference]: With dead ends: 454 [2018-10-27 09:08:07,803 INFO L226 Difference]: Without dead ends: 308 [2018-10-27 09:08:07,804 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 637 GetRequests, 540 SyntacticMatches, 0 SemanticMatches, 97 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 188 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=4851, Invalid=4851, Unknown=0, NotChecked=0, Total=9702 [2018-10-27 09:08:07,804 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 308 states. [2018-10-27 09:08:07,808 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 308 to 298. [2018-10-27 09:08:07,808 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 298 states. [2018-10-27 09:08:07,809 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 298 states to 298 states and 299 transitions. [2018-10-27 09:08:07,809 INFO L78 Accepts]: Start accepts. Automaton has 298 states and 299 transitions. Word has length 294 [2018-10-27 09:08:07,809 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:08:07,810 INFO L481 AbstractCegarLoop]: Abstraction has 298 states and 299 transitions. [2018-10-27 09:08:07,810 INFO L482 AbstractCegarLoop]: Interpolant automaton has 51 states. [2018-10-27 09:08:07,810 INFO L276 IsEmpty]: Start isEmpty. Operand 298 states and 299 transitions. [2018-10-27 09:08:07,811 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 298 [2018-10-27 09:08:07,811 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:08:07,811 INFO L375 BasicCegarLoop]: trace histogram [49, 48, 48, 47, 46, 46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:08:07,812 INFO L424 AbstractCegarLoop]: === Iteration 51 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:08:07,812 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:08:07,812 INFO L82 PathProgramCache]: Analyzing trace with hash -1089373516, now seen corresponding path program 47 times [2018-10-27 09:08:07,812 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:08:07,813 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:08:07,813 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:08:07,813 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:08:07,813 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:08:07,862 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:08:09,070 INFO L134 CoverageAnalysis]: Checked inductivity of 6677 backedges. 0 proven. 3480 refuted. 0 times theorem prover too weak. 3197 trivial. 0 not checked. [2018-10-27 09:08:09,071 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:08:09,071 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:08:09,071 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:08:09,071 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:08:09,071 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:08:09,071 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 50 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 50 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:08:09,081 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 09:08:09,081 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 09:08:26,501 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 47 check-sat command(s) [2018-10-27 09:08:26,502 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:08:26,519 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:08:26,747 INFO L134 CoverageAnalysis]: Checked inductivity of 6677 backedges. 0 proven. 3197 refuted. 0 times theorem prover too weak. 3480 trivial. 0 not checked. [2018-10-27 09:08:26,747 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:08:29,344 INFO L134 CoverageAnalysis]: Checked inductivity of 6677 backedges. 0 proven. 3197 refuted. 0 times theorem prover too weak. 3480 trivial. 0 not checked. [2018-10-27 09:08:29,372 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:08:29,372 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 51, 51] total 103 [2018-10-27 09:08:29,372 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:08:29,372 INFO L460 AbstractCegarLoop]: Interpolant automaton has 54 states [2018-10-27 09:08:29,373 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2018-10-27 09:08:29,373 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4861, Invalid=5645, Unknown=0, NotChecked=0, Total=10506 [2018-10-27 09:08:29,373 INFO L87 Difference]: Start difference. First operand 298 states and 299 transitions. Second operand 54 states. [2018-10-27 09:08:29,945 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:08:29,945 INFO L93 Difference]: Finished difference Result 463 states and 468 transitions. [2018-10-27 09:08:29,946 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2018-10-27 09:08:29,946 INFO L78 Accepts]: Start accepts. Automaton has 54 states. Word has length 297 [2018-10-27 09:08:29,947 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:08:29,949 INFO L225 Difference]: With dead ends: 463 [2018-10-27 09:08:29,949 INFO L226 Difference]: Without dead ends: 312 [2018-10-27 09:08:29,950 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 645 GetRequests, 543 SyntacticMatches, 0 SemanticMatches, 102 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 530 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=4867, Invalid=5845, Unknown=0, NotChecked=0, Total=10712 [2018-10-27 09:08:29,950 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 312 states. [2018-10-27 09:08:29,953 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 312 to 310. [2018-10-27 09:08:29,953 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 310 states. [2018-10-27 09:08:29,954 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 310 states to 310 states and 311 transitions. [2018-10-27 09:08:29,954 INFO L78 Accepts]: Start accepts. Automaton has 310 states and 311 transitions. Word has length 297 [2018-10-27 09:08:29,954 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:08:29,955 INFO L481 AbstractCegarLoop]: Abstraction has 310 states and 311 transitions. [2018-10-27 09:08:29,955 INFO L482 AbstractCegarLoop]: Interpolant automaton has 54 states. [2018-10-27 09:08:29,955 INFO L276 IsEmpty]: Start isEmpty. Operand 310 states and 311 transitions. [2018-10-27 09:08:29,956 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 310 [2018-10-27 09:08:29,956 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:08:29,956 INFO L375 BasicCegarLoop]: trace histogram [50, 50, 49, 49, 49, 49, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:08:29,957 INFO L424 AbstractCegarLoop]: === Iteration 52 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:08:29,957 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:08:29,957 INFO L82 PathProgramCache]: Analyzing trace with hash 842936503, now seen corresponding path program 48 times [2018-10-27 09:08:29,957 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:08:29,958 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:08:29,958 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:08:29,958 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:08:29,958 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:08:30,001 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:08:31,040 INFO L134 CoverageAnalysis]: Checked inductivity of 7252 backedges. 0 proven. 3626 refuted. 0 times theorem prover too weak. 3626 trivial. 0 not checked. [2018-10-27 09:08:31,041 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:08:31,041 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:08:31,041 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:08:31,041 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:08:31,041 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:08:31,041 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 51 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 51 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:08:31,050 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 09:08:31,050 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 09:08:31,276 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 09:08:31,276 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:08:31,283 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:08:31,354 INFO L134 CoverageAnalysis]: Checked inductivity of 7252 backedges. 0 proven. 3626 refuted. 0 times theorem prover too weak. 3626 trivial. 0 not checked. [2018-10-27 09:08:31,354 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:08:34,281 INFO L134 CoverageAnalysis]: Checked inductivity of 7252 backedges. 0 proven. 3626 refuted. 0 times theorem prover too weak. 3626 trivial. 0 not checked. [2018-10-27 09:08:34,303 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:08:34,303 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [52, 52, 52] total 103 [2018-10-27 09:08:34,303 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:08:34,304 INFO L460 AbstractCegarLoop]: Interpolant automaton has 53 states [2018-10-27 09:08:34,304 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2018-10-27 09:08:34,305 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5253, Invalid=5253, Unknown=0, NotChecked=0, Total=10506 [2018-10-27 09:08:34,305 INFO L87 Difference]: Start difference. First operand 310 states and 311 transitions. Second operand 53 states. [2018-10-27 09:08:34,970 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:08:34,970 INFO L93 Difference]: Finished difference Result 474 states and 477 transitions. [2018-10-27 09:08:34,970 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2018-10-27 09:08:34,970 INFO L78 Accepts]: Start accepts. Automaton has 53 states. Word has length 309 [2018-10-27 09:08:34,970 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:08:34,971 INFO L225 Difference]: With dead ends: 474 [2018-10-27 09:08:34,972 INFO L226 Difference]: Without dead ends: 319 [2018-10-27 09:08:34,972 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 669 GetRequests, 568 SyntacticMatches, 0 SemanticMatches, 101 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 196 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=5253, Invalid=5253, Unknown=0, NotChecked=0, Total=10506 [2018-10-27 09:08:34,973 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 319 states. [2018-10-27 09:08:34,976 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 319 to 313. [2018-10-27 09:08:34,976 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 313 states. [2018-10-27 09:08:34,977 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 313 states to 313 states and 314 transitions. [2018-10-27 09:08:34,977 INFO L78 Accepts]: Start accepts. Automaton has 313 states and 314 transitions. Word has length 309 [2018-10-27 09:08:34,977 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:08:34,978 INFO L481 AbstractCegarLoop]: Abstraction has 313 states and 314 transitions. [2018-10-27 09:08:34,978 INFO L482 AbstractCegarLoop]: Interpolant automaton has 53 states. [2018-10-27 09:08:34,978 INFO L276 IsEmpty]: Start isEmpty. Operand 313 states and 314 transitions. [2018-10-27 09:08:34,979 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 313 [2018-10-27 09:08:34,979 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:08:34,979 INFO L375 BasicCegarLoop]: trace histogram [51, 50, 50, 50, 49, 49, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:08:34,979 INFO L424 AbstractCegarLoop]: === Iteration 53 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:08:34,979 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:08:34,980 INFO L82 PathProgramCache]: Analyzing trace with hash 1692579666, now seen corresponding path program 49 times [2018-10-27 09:08:34,980 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:08:34,980 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:08:34,980 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:08:34,980 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:08:34,980 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:08:35,032 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:08:36,240 INFO L134 CoverageAnalysis]: Checked inductivity of 7401 backedges. 0 proven. 3775 refuted. 0 times theorem prover too weak. 3626 trivial. 0 not checked. [2018-10-27 09:08:36,240 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:08:36,240 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:08:36,241 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:08:36,241 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:08:36,241 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:08:36,241 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 52 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 52 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:08:36,248 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:08:36,249 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:08:36,474 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:08:36,480 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:08:36,558 INFO L134 CoverageAnalysis]: Checked inductivity of 7401 backedges. 0 proven. 3775 refuted. 0 times theorem prover too weak. 3626 trivial. 0 not checked. [2018-10-27 09:08:36,558 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:08:39,667 INFO L134 CoverageAnalysis]: Checked inductivity of 7401 backedges. 0 proven. 3775 refuted. 0 times theorem prover too weak. 3626 trivial. 0 not checked. [2018-10-27 09:08:39,688 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:08:39,688 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 53, 53] total 105 [2018-10-27 09:08:39,688 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:08:39,689 INFO L460 AbstractCegarLoop]: Interpolant automaton has 54 states [2018-10-27 09:08:39,689 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2018-10-27 09:08:39,690 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5460, Invalid=5460, Unknown=0, NotChecked=0, Total=10920 [2018-10-27 09:08:39,690 INFO L87 Difference]: Start difference. First operand 313 states and 314 transitions. Second operand 54 states. [2018-10-27 09:08:40,405 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:08:40,405 INFO L93 Difference]: Finished difference Result 481 states and 485 transitions. [2018-10-27 09:08:40,406 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2018-10-27 09:08:40,406 INFO L78 Accepts]: Start accepts. Automaton has 54 states. Word has length 312 [2018-10-27 09:08:40,406 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:08:40,407 INFO L225 Difference]: With dead ends: 481 [2018-10-27 09:08:40,407 INFO L226 Difference]: Without dead ends: 326 [2018-10-27 09:08:40,408 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 676 GetRequests, 573 SyntacticMatches, 0 SemanticMatches, 103 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 200 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=5460, Invalid=5460, Unknown=0, NotChecked=0, Total=10920 [2018-10-27 09:08:40,408 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 326 states. [2018-10-27 09:08:40,412 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 326 to 316. [2018-10-27 09:08:40,412 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 316 states. [2018-10-27 09:08:40,413 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 316 states to 316 states and 317 transitions. [2018-10-27 09:08:40,413 INFO L78 Accepts]: Start accepts. Automaton has 316 states and 317 transitions. Word has length 312 [2018-10-27 09:08:40,413 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:08:40,413 INFO L481 AbstractCegarLoop]: Abstraction has 316 states and 317 transitions. [2018-10-27 09:08:40,413 INFO L482 AbstractCegarLoop]: Interpolant automaton has 54 states. [2018-10-27 09:08:40,413 INFO L276 IsEmpty]: Start isEmpty. Operand 316 states and 317 transitions. [2018-10-27 09:08:40,415 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 316 [2018-10-27 09:08:40,415 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:08:40,415 INFO L375 BasicCegarLoop]: trace histogram [52, 51, 51, 50, 49, 49, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:08:40,415 INFO L424 AbstractCegarLoop]: === Iteration 54 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:08:40,416 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:08:40,416 INFO L82 PathProgramCache]: Analyzing trace with hash -1125194025, now seen corresponding path program 50 times [2018-10-27 09:08:40,416 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:08:40,416 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:08:40,417 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:08:40,417 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:08:40,417 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:08:40,465 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:08:41,554 INFO L134 CoverageAnalysis]: Checked inductivity of 7553 backedges. 0 proven. 3927 refuted. 0 times theorem prover too weak. 3626 trivial. 0 not checked. [2018-10-27 09:08:41,555 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:08:41,555 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:08:41,555 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:08:41,555 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:08:41,555 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:08:41,555 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 53 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 53 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:08:41,562 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 09:08:41,562 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 09:09:01,083 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 50 check-sat command(s) [2018-10-27 09:09:01,083 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:09:01,101 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:09:01,228 INFO L134 CoverageAnalysis]: Checked inductivity of 7553 backedges. 0 proven. 3626 refuted. 0 times theorem prover too weak. 3927 trivial. 0 not checked. [2018-10-27 09:09:01,228 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:09:04,493 INFO L134 CoverageAnalysis]: Checked inductivity of 7553 backedges. 0 proven. 3626 refuted. 0 times theorem prover too weak. 3927 trivial. 0 not checked. [2018-10-27 09:09:04,521 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:09:04,521 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [54, 54, 54] total 109 [2018-10-27 09:09:04,521 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:09:04,522 INFO L460 AbstractCegarLoop]: Interpolant automaton has 57 states [2018-10-27 09:09:04,523 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2018-10-27 09:09:04,523 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5470, Invalid=6302, Unknown=0, NotChecked=0, Total=11772 [2018-10-27 09:09:04,524 INFO L87 Difference]: Start difference. First operand 316 states and 317 transitions. Second operand 57 states. [2018-10-27 09:09:05,131 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:09:05,131 INFO L93 Difference]: Finished difference Result 490 states and 495 transitions. [2018-10-27 09:09:05,132 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2018-10-27 09:09:05,132 INFO L78 Accepts]: Start accepts. Automaton has 57 states. Word has length 315 [2018-10-27 09:09:05,132 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:09:05,134 INFO L225 Difference]: With dead ends: 490 [2018-10-27 09:09:05,134 INFO L226 Difference]: Without dead ends: 330 [2018-10-27 09:09:05,135 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 684 GetRequests, 576 SyntacticMatches, 0 SemanticMatches, 108 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 563 ImplicationChecksByTransitivity, 4.2s TimeCoverageRelationStatistics Valid=5476, Invalid=6514, Unknown=0, NotChecked=0, Total=11990 [2018-10-27 09:09:05,136 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 330 states. [2018-10-27 09:09:05,140 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 330 to 328. [2018-10-27 09:09:05,140 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 328 states. [2018-10-27 09:09:05,141 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 328 states to 328 states and 329 transitions. [2018-10-27 09:09:05,141 INFO L78 Accepts]: Start accepts. Automaton has 328 states and 329 transitions. Word has length 315 [2018-10-27 09:09:05,141 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:09:05,141 INFO L481 AbstractCegarLoop]: Abstraction has 328 states and 329 transitions. [2018-10-27 09:09:05,141 INFO L482 AbstractCegarLoop]: Interpolant automaton has 57 states. [2018-10-27 09:09:05,141 INFO L276 IsEmpty]: Start isEmpty. Operand 328 states and 329 transitions. [2018-10-27 09:09:05,143 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 328 [2018-10-27 09:09:05,143 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:09:05,143 INFO L375 BasicCegarLoop]: trace histogram [53, 53, 52, 52, 52, 52, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:09:05,143 INFO L424 AbstractCegarLoop]: === Iteration 55 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:09:05,144 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:09:05,144 INFO L82 PathProgramCache]: Analyzing trace with hash 1516328116, now seen corresponding path program 51 times [2018-10-27 09:09:05,144 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:09:05,144 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:09:05,145 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:09:05,145 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:09:05,145 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:09:05,205 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:09:06,400 INFO L134 CoverageAnalysis]: Checked inductivity of 8164 backedges. 0 proven. 4082 refuted. 0 times theorem prover too weak. 4082 trivial. 0 not checked. [2018-10-27 09:09:06,400 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:09:06,400 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:09:06,400 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:09:06,400 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:09:06,400 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:09:06,400 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 54 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 54 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:09:06,407 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 09:09:06,407 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 09:09:06,648 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 09:09:06,648 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:09:06,655 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:09:06,731 INFO L134 CoverageAnalysis]: Checked inductivity of 8164 backedges. 0 proven. 4082 refuted. 0 times theorem prover too weak. 4082 trivial. 0 not checked. [2018-10-27 09:09:06,731 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:09:09,959 INFO L134 CoverageAnalysis]: Checked inductivity of 8164 backedges. 0 proven. 4082 refuted. 0 times theorem prover too weak. 4082 trivial. 0 not checked. [2018-10-27 09:09:09,981 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:09:09,982 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [55, 55, 55] total 109 [2018-10-27 09:09:09,982 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:09:09,982 INFO L460 AbstractCegarLoop]: Interpolant automaton has 56 states [2018-10-27 09:09:09,983 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2018-10-27 09:09:09,983 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5886, Invalid=5886, Unknown=0, NotChecked=0, Total=11772 [2018-10-27 09:09:09,984 INFO L87 Difference]: Start difference. First operand 328 states and 329 transitions. Second operand 56 states. [2018-10-27 09:09:10,751 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:09:10,752 INFO L93 Difference]: Finished difference Result 501 states and 504 transitions. [2018-10-27 09:09:10,752 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2018-10-27 09:09:10,752 INFO L78 Accepts]: Start accepts. Automaton has 56 states. Word has length 327 [2018-10-27 09:09:10,753 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:09:10,754 INFO L225 Difference]: With dead ends: 501 [2018-10-27 09:09:10,754 INFO L226 Difference]: Without dead ends: 337 [2018-10-27 09:09:10,755 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 708 GetRequests, 601 SyntacticMatches, 0 SemanticMatches, 107 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 208 ImplicationChecksByTransitivity, 4.2s TimeCoverageRelationStatistics Valid=5886, Invalid=5886, Unknown=0, NotChecked=0, Total=11772 [2018-10-27 09:09:10,755 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 337 states. [2018-10-27 09:09:10,759 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 337 to 331. [2018-10-27 09:09:10,759 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 331 states. [2018-10-27 09:09:10,760 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 331 states to 331 states and 332 transitions. [2018-10-27 09:09:10,760 INFO L78 Accepts]: Start accepts. Automaton has 331 states and 332 transitions. Word has length 327 [2018-10-27 09:09:10,760 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:09:10,760 INFO L481 AbstractCegarLoop]: Abstraction has 331 states and 332 transitions. [2018-10-27 09:09:10,761 INFO L482 AbstractCegarLoop]: Interpolant automaton has 56 states. [2018-10-27 09:09:10,761 INFO L276 IsEmpty]: Start isEmpty. Operand 331 states and 332 transitions. [2018-10-27 09:09:10,762 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 331 [2018-10-27 09:09:10,762 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:09:10,763 INFO L375 BasicCegarLoop]: trace histogram [54, 53, 53, 53, 52, 52, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:09:10,763 INFO L424 AbstractCegarLoop]: === Iteration 56 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:09:10,763 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:09:10,763 INFO L82 PathProgramCache]: Analyzing trace with hash 1633258127, now seen corresponding path program 52 times [2018-10-27 09:09:10,763 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:09:10,764 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:09:10,764 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:09:10,764 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:09:10,764 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:09:10,835 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:09:12,077 INFO L134 CoverageAnalysis]: Checked inductivity of 8322 backedges. 0 proven. 4240 refuted. 0 times theorem prover too weak. 4082 trivial. 0 not checked. [2018-10-27 09:09:12,077 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:09:12,077 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:09:12,077 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:09:12,077 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:09:12,077 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:09:12,077 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 55 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 55 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:09:12,085 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:09:12,085 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:09:12,326 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:09:12,333 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:09:12,405 INFO L134 CoverageAnalysis]: Checked inductivity of 8322 backedges. 0 proven. 4240 refuted. 0 times theorem prover too weak. 4082 trivial. 0 not checked. [2018-10-27 09:09:12,405 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:09:15,685 INFO L134 CoverageAnalysis]: Checked inductivity of 8322 backedges. 0 proven. 4240 refuted. 0 times theorem prover too weak. 4082 trivial. 0 not checked. [2018-10-27 09:09:15,707 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:09:15,707 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [56, 56, 56] total 111 [2018-10-27 09:09:15,708 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:09:15,708 INFO L460 AbstractCegarLoop]: Interpolant automaton has 57 states [2018-10-27 09:09:15,708 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2018-10-27 09:09:15,709 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6105, Invalid=6105, Unknown=0, NotChecked=0, Total=12210 [2018-10-27 09:09:15,709 INFO L87 Difference]: Start difference. First operand 331 states and 332 transitions. Second operand 57 states. [2018-10-27 09:09:16,564 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:09:16,565 INFO L93 Difference]: Finished difference Result 508 states and 512 transitions. [2018-10-27 09:09:16,565 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2018-10-27 09:09:16,565 INFO L78 Accepts]: Start accepts. Automaton has 57 states. Word has length 330 [2018-10-27 09:09:16,565 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:09:16,566 INFO L225 Difference]: With dead ends: 508 [2018-10-27 09:09:16,566 INFO L226 Difference]: Without dead ends: 344 [2018-10-27 09:09:16,567 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 715 GetRequests, 606 SyntacticMatches, 0 SemanticMatches, 109 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 212 ImplicationChecksByTransitivity, 4.3s TimeCoverageRelationStatistics Valid=6105, Invalid=6105, Unknown=0, NotChecked=0, Total=12210 [2018-10-27 09:09:16,567 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 344 states. [2018-10-27 09:09:16,571 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 344 to 334. [2018-10-27 09:09:16,571 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 334 states. [2018-10-27 09:09:16,571 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 334 states to 334 states and 335 transitions. [2018-10-27 09:09:16,571 INFO L78 Accepts]: Start accepts. Automaton has 334 states and 335 transitions. Word has length 330 [2018-10-27 09:09:16,572 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:09:16,572 INFO L481 AbstractCegarLoop]: Abstraction has 334 states and 335 transitions. [2018-10-27 09:09:16,572 INFO L482 AbstractCegarLoop]: Interpolant automaton has 57 states. [2018-10-27 09:09:16,572 INFO L276 IsEmpty]: Start isEmpty. Operand 334 states and 335 transitions. [2018-10-27 09:09:16,573 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 334 [2018-10-27 09:09:16,574 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:09:16,574 INFO L375 BasicCegarLoop]: trace histogram [55, 54, 54, 53, 52, 52, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:09:16,574 INFO L424 AbstractCegarLoop]: === Iteration 57 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:09:16,574 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:09:16,574 INFO L82 PathProgramCache]: Analyzing trace with hash 1876738772, now seen corresponding path program 53 times [2018-10-27 09:09:16,575 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:09:16,575 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:09:16,575 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:09:16,575 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:09:16,575 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:09:16,625 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat Received shutdown request... [2018-10-27 09:09:16,891 WARN L550 AbstractCegarLoop]: Verification canceled [2018-10-27 09:09:16,895 WARN L205 ceAbstractionStarter]: Timeout [2018-10-27 09:09:16,896 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 27.10 09:09:16 BoogieIcfgContainer [2018-10-27 09:09:16,896 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-10-27 09:09:16,897 INFO L168 Benchmark]: Toolchain (without parser) took 243310.50 ms. Allocated memory was 1.5 GB in the beginning and 2.7 GB in the end (delta: 1.2 GB). Free memory was 1.4 GB in the beginning and 2.0 GB in the end (delta: -638.7 MB). Peak memory consumption was 565.6 MB. Max. memory is 7.1 GB. [2018-10-27 09:09:16,898 INFO L168 Benchmark]: CDTParser took 0.29 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-10-27 09:09:16,899 INFO L168 Benchmark]: CACSL2BoogieTranslator took 326.93 ms. Allocated memory is still 1.5 GB. Free memory was 1.4 GB in the beginning and 1.4 GB in the end (delta: 10.6 MB). Peak memory consumption was 10.6 MB. Max. memory is 7.1 GB. [2018-10-27 09:09:16,899 INFO L168 Benchmark]: Boogie Procedure Inliner took 60.49 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-10-27 09:09:16,900 INFO L168 Benchmark]: Boogie Preprocessor took 46.63 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-10-27 09:09:16,900 INFO L168 Benchmark]: RCFGBuilder took 604.81 ms. Allocated memory was 1.5 GB in the beginning and 2.2 GB in the end (delta: 699.4 MB). Free memory was 1.4 GB in the beginning and 2.1 GB in the end (delta: -728.9 MB). Peak memory consumption was 15.0 MB. Max. memory is 7.1 GB. [2018-10-27 09:09:16,901 INFO L168 Benchmark]: TraceAbstraction took 242265.56 ms. Allocated memory was 2.2 GB in the beginning and 2.7 GB in the end (delta: 504.9 MB). Free memory was 2.1 GB in the beginning and 2.0 GB in the end (delta: 79.7 MB). Peak memory consumption was 584.5 MB. Max. memory is 7.1 GB. [2018-10-27 09:09:16,904 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.29 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 326.93 ms. Allocated memory is still 1.5 GB. Free memory was 1.4 GB in the beginning and 1.4 GB in the end (delta: 10.6 MB). Peak memory consumption was 10.6 MB. Max. memory is 7.1 GB. * Boogie Procedure Inliner took 60.49 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. * Boogie Preprocessor took 46.63 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. * RCFGBuilder took 604.81 ms. Allocated memory was 1.5 GB in the beginning and 2.2 GB in the end (delta: 699.4 MB). Free memory was 1.4 GB in the beginning and 2.1 GB in the end (delta: -728.9 MB). Peak memory consumption was 15.0 MB. Max. memory is 7.1 GB. * TraceAbstraction took 242265.56 ms. Allocated memory was 2.2 GB in the beginning and 2.7 GB in the end (delta: 504.9 MB). Free memory was 2.1 GB in the beginning and 2.0 GB in the end (delta: 79.7 MB). Peak memory consumption was 584.5 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - TimeoutResultAtElement [Line: 4]: Timeout (TraceAbstraction) Unable to prove that call of __VERIFIER_error() unreachable (line 4). Cancelled while BasicCegarLoop was analyzing trace of length 334 with TraceHistMax 55,while InterpolatingTraceCheckCraig was constructing Craig interpolants,while PredicateComparison was comparing new predicate (quantifier-free) to 20 known predicates. - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 25 locations, 1 error locations. TIMEOUT Result, 242.1s OverallTime, 57 OverallIterations, 55 TraceHistogramMax, 22.1s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 723 SDtfs, 5758 SDslu, 10208 SDs, 0 SdLazy, 10652 SolverSat, 2190 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 14.5s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 20050 GetRequests, 16967 SyntacticMatches, 0 SemanticMatches, 3083 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8995 ImplicationChecksByTransitivity, 107.5s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=334occurred in iteration=56, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.5s AbstIntTime, 2 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: 0.3s AutomataMinimizationTime, 56 MinimizatonAttempts, 331 StatesRemovedByMinimization, 55 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TraceCheckStatistics: 1.8s SsaConstructionTime, 99.2s SatisfiabilityAnalysisTime, 114.2s InterpolantComputationTime, 18514 NumberOfCodeBlocks, 18406 NumberOfCodeBlocksAsserted, 552 NumberOfCheckSat, 27593 ConstructedInterpolants, 0 QuantifiedInterpolants, 11980833 SizeOfPredicates, 75 NumberOfNonLiveVariables, 45316 ConjunctsInSsa, 1599 ConjunctsInUnsatCore, 164 InterpolantComputations, 4 PerfectInterpolantSequences, 224760/451251 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate could not prove your program: Timeout Completed graceful shutdown